spamassassin: whitespace cleanups

removed lots of trailing whitespace
spamassassin: added spamassassin.ini
store spamd response in connection note,

added per-user SA pref support for vpopmail
refactored into paragraph sized functions
SA docs: fix typo & grammar error
spamassassin: pass SA headers through unaltered

this allows sites to customize the presence and appearance of SA headers without touching this plugin
spamassassin: use parseFloat for numberic compare
WS cleanup
spamassassin: restrict X-Spam-(.*) to ASCII printable

and comment out spamd_user in .ini
sa: added modern_status_syntax=1 to ini

escaped _ in spamassassin.md
round MB to 2 decimals in “too big” log message
sa: added modern_status_syntax=1 to ini

escaped _ in spamassassin.md
round MB to 2 decimals in “too big” log message

(missed a couple files in previous commit)