workaround missing key on offer

KeyError: 'golem.com.scheme.payu.interval_sec' now missing on offers so a quick substitution with a blank string is made. note, next version should proactively substitute other keys that may go missing.

display relevant cols and provide more raw details and link to stats

• version column only displayed if old version requested making for more compact view
• raw info provides detailed stats from stats.golem.network including benchmark
• context menu adds command to open web browser to stats node page

add latest version checkbox; scrollbar to offer list

• by default, only the latest version is listed (optional with checkbox on interface)
• a scrollbar has been added to the side of the offer list to improve the user's perception of size and boundaries

fix send to clipboard button

v0.2.1

exclude newline on send to clipboard

add filterms context dialog for selected items

• a context menu command opens a dialog to help construct a filterms filter

handle 0 results; refix keep sel on column move

• handle the case where there are 0 results
• various ui fixes

add selection panel

• list selections in a panel on the right of the main table
• various ui improvements / fixes

retain multiple selections; fix control disabling bug

• multiple selections (as many as are pertinent) are maintained after re-ordering and filtering
• moving columns may have caused the controls to stay disabled - fixed

fix filters; keep selections

• a single selection that is maintained across a filter is maintained
• filter values have an epsilon to include very near values and avoid round off exclusions
• fixed column renamed to start for clarity

fix other subnet handling; loosen precision on filters

• previously the radio entry for another subnet was not working properly - fixed
• the precision was too arbitrary to match that of golem when calculating /sec from /hr - fixed