Release 0.8.6 "Daniel" - Bug fixes and optimizations

This release is mostly intended to fix a number of issues reported by users or discovered during testing.

Features

• Fancy digits are now accepted for decimal and based numbers. This means that 1.E³² is now a valid input to Str→, ensuring that we can parse the output of →Str if it uses fancy characters, or that copy-paste works from the stack to the editor.
• Accept array arguments for min and max, applied element-wise in the same way as addition for example.
• Add CompatibleBasedNumbers setting to render 16#AB as #ABh like HP calculators.
• Improve protection against mismatched QSPI and PGM. Only binaries issued from the same build are now accepted. This is mostly of interest to developers, although releases that are very close to one another, like v0.8.4 and v0.8.5 were, can require this protection.
• On DM32, numbers with an explicit numerical base keep that base if it's 16, 10, 8 or 2. For example, 10#200 and #200₁₀ will display in base 10 irrespective of the Base setting, just like #200d.
• Add ϵ character (Greek Lunate epsilon), which appears in some equations.
• Add text alignment options to DrawText, making it possible to align text horizontally or vertically. See examples at end of the Texts program in Demo.48s
• Add UnitsSIPrefixCycle command to set the variable with the same name to customize SI prefixes cycling for units on the command-line.
  After "KMG" UnitsSIPrefixCycle, typing the Cycle key (_×10ⁿ or EEX) with 1_B will cycle through 1_KB, 1_MB, 1_GB and back to 1_B.
• Accept u as an alternative SI prefix for "micro-", e.g. 1_us. This is intended to allow entering of the "micro" prefix using transient alpha mode.
• Add help lookup for solver variables. When in the SolverMenu, holding the function key for a vairable brings up the help for the corresponding variable in the equations library.
• Add SiDensity (SIDENS on HP) and Fanning functions to the library. These functions are used by some equations in the library.
• Add invert alias for 1/x operation (like negate for neg).

Bug fixes

• Fix unit scale cycling for multi-character units
• Fix incorrect computation of output matrix size for non-square matrices. [[1 2]][[3 4]] + now works.
• Negation on based numbers and polynomials now works.
• Conversion of decimal values smaller than 1.0 to integer no longer crashes (this could only happen with the RanM command)
• Render - for first term of polynonials if negative
• On DM42, update the bases menu when cycling based numbers
• Fix parameter mixup for call to program::run. In theory, this could lead to programs not evaluating correctly if NoLastArguments setting was set, although another bug apparently made this very unlikely to be observed.
• Update index footer to point to https://48calc.org instead of obsolete https://github.io location.
• Updating a for loop variable from within the loop now behaves like on HP calculators, and can be used to control loop exit.
• Do not draw activity indicator in graphical mode. This was a regression introduced with BusyIndicatorRefresh.
• Mark xroot command as implemented in the PowersMenu
• Use consistent case for variable x in the equations library
• Do not error out comparing text values
• doc: Fix typo latter -> letter

Improvements

• Add auto-cleaner optimizations for matrix and vector operations. This reduces the memory usage and frequency of garbage collections.
• Reduce random bias for integer input, e.g. -10 10 random no longer has a +0.5 bias on average.
• doc: Several updates and fixes to the documentation, notably with respect to the description of the current status, and instructions for Windows developers.
• Add →Prg alias for →Program
• Add the simulator minimum window size
• Add rmdir as an alias for pgdir. "This is Unix".
• Add L (uppercase) spelling for "liter" unit
• doc: Avoid overlapping aliases in Rcl/ help text by adding some
  aditional text to the Rcl* help.
• doc: Add documentation for SolverMenuSolve and SolverMenuRecall
• doc: Fix documentation for AssignKey
• doc: Add documentation for comparisons
• doc: Remove duplicate dup
• doc: Update documentation about add
• doc: Refer to CharactersMenu and Catalog in alpha overview
• doc: Update keyboard sequences typography
• doc: Remove false claim that interactive stack is not implemented
• doc: Update implemented / unimplemented list

Signed-off-by: Christophe de Dinechin christophe@dinechin.org