Fixup names of output files.

Use _seconds not _sec for output names.
Fixup pmccontrol name to be consistent.
Allow read input file from stdin.

We need this for processing all files without having to
extract them to disk.
Allow us to append to CSV output files.
Unbuffer stdout so we can see progress.
Fix error in unrotated files.

The previous code would bomb if the file didn't
start with "logfile turned over", fix this.