XFS filesystem provides three different quota types. UID-based,
GID-based and "project quota" path name based.

Add support for test parameter "-xfsprojquota N" which allows
looking for files with specified project quota ID.

Add support for "%q" format which allows project quota ID
to be displayed.

Example:
$ ./find /home/users/arekm/xtest -printf "name=%f projquotaid=%q\n"
name=xtest projquotaid=0
name=proj50 projquotaid=50
name=aaa projquotaid=50
name=aaadsfdsf projquotaid=50
name=something projquotaid=50
name=34knjf projquotaid=50
name=proj60 projquotaid=60
name=34knjf projquotaid=60
name=34knjfwenhwjqe projquotaid=60
name=dsfdsfknjfwenhwjqe projquotaid=60
name=proj70 projquotaid=70
name=7sfdsfdsf projquotaid=70
name=7sf4344 projquotaid=70
name=7sf4344ad projquotaid=70

$ ./find /home/users/arekm/xtest -xfsprojquota 50
/home/users/arekm/xtest/proj50
/home/users/arekm/xtest/proj50/aaa
/home/users/arekm/xtest/proj50/aaadsfdsf
/home/users/arekm/xtest/proj50/something
/home/users/arekm/xtest/proj50/34knjf