Features
* Add capability of batch conversion (file list read from some file or direct list of files in specified folder?)
* Add capability to convert old format (centimils) footprint files (need to be awared of file format to do correct parse - not convert angle values etc.). Use --oldformat parameter for that.
* Add capability to convert other units line micrometers (um2mil, mil2um, um2mm, mm2um) etc. 

Bugs
* Remove last space on each output line.
* Simplify the convertLine routine.
* What we are going to do if output file exists? Exit program or rewrite output file? Implement the desired behaviour.
* Handle the direction inproper value of --[mil2mm|mm2mil] parameter with some message to user and exit the program.
