Fixes #1210 x ticks and labels are aligned

[pchelle]

Caution

the $45 \degree$ rotated labels get messed up if only right alignment is performed for x-axis tick labels.
Thus, the labels also required a vertical top alignment which is centered by {tlf}

Note

the centered vertical alignment is best for the $0 \degree$ and $90 \degree$ rotations of the x-axis tick labels
and also best for y-axis tick labels regardless of rotations

[pchelle]

@Yuri05 ,
I don't find how to re-trigger appveyor now that ospsuite builds again.
Can you let me know how to do it ?

[Yuri05]

@Yuri05 , I don't find how to re-trigger appveyor now that ospsuite builds again. Can you let me know how to do it ?

before rebuilding: can you sync your source branch with the develop branch of the OSP?
and also extend install_dependencies.R with the openxlsx package from cran?