made when testing peach blend files wont have path issues when sent to the renderfarm.
* log failed path conversions
* clean the path so //foo/../foo/ is removed (not sure why but some peach files had this problem)
Also added a function to util.c
BLI_cleanup_file, same as BLI_cleanup_dir but dosnt add a slash at the end.
Useful to use before sending blend files to the renderfarm.
* Make all Paths Relative - makes any absolute paths relative.
* Report Missing Files - creates a textblock listing all missing files.
* Find Missing Files - searches a directory recursively for filenames that dont exist at their current path.
Added a path looper type and functions that currently loop on image, sound, font and external library paths.
