MSRE - Simplify 'first comment line' handling

Fix and greatly simplify 'first comment handling'.

Just copy everything up to the line before the first enabled or disabled
rule to the new file form the original
MSRE: Use MailScanner's rule direction parsing

Use MailScanner's rule parsing method, and add FromAndTo (or ToAndFrom)

FromAndTo:, toandfrom:, fromorto:, toorfrom:, handy:, fromage:, stoat:,
and RetroViruses: are all valid 'directions'.
MSRE: Update Changelog
Merge pull request #64 from philrandal/master

MSRE - Simplify 'first comment line' handling