Log Message:
tex-pdfcrop{,-doc}: update to 1.40

* adapted to pdf version 2.0,
* adapted the luatex code to the current luatex primitives
* corrected a problem with the pdfversion setting when using xetex.
* added an uncompress option (for debugging)
* improved ghostscript detection on windows when a bash is used
* added direct pdf version support to xetex.