Usage:
a=t - tree listing
a=d - directory
a=s - simple (no recursion) dir list
&p=path
for example: a=t&p=.
&API used by chkgal
&crlf report if text file has non-standard line endings, eg. LF only on DOS
&CSV output
&posp= is special for PoSP - try it in a directory containing jpegs
&slim a=t option only: more detailed scanning