reinstated.  The analysis_id in the analysis table and in the
analysis_description table seems to become unsynced otherwise.

Better help.

Make help text better.

about how to run the script.

throw-message edited

doc added

added new optional  argument of hcoverage to get_all_ProteinAlignFeatures and get_all_DnaAlignFeatures

Fix head of script.

Change POSIX import to prevent it importing unused functions (e.g. remove which conflicts with the remove method defined in Gene).