${REVISION} - revision info string (tag or branch:hash date time)
${LABEL} - package label string (tag or date-hash)
${DAY} - day of last commit
${MONTH} - month of last commit
${YEAR} - year of last commit
Conflicts:
package/Makefile
Line endings in the UAVO XML files differ from file to file
and this results in different SHA1 sums being computed on
Windows vs. Linux/Mac.
This normalizes the line endings to LF (python native) while
processing the XML files.
In python, os.walk() is not sorted. This can result in the
hash being computed over the files in different orders on
different OSes, or even after touching a directory.
This ensures that the files are considered in lexical order
so that the hash is stable.
