allow for a style.ini in conf/<tpl>/style.ini

This is another go at what pull request #227 tried to do. This removes
support for a style.local.ini in the template file in preference of a
style.ini in the conf folder
Readded style.local.ini and deprecated it
removed debug statement
fixed conf style.ini not working due to wrong incbase path
Merge remote-tracking branch 'origin/confstyleini' into confstyleini
Merge pull request #262 from splitbrain/confstyleini

allow for a style.ini in conf/<tpl>/style.ini
added style.local.ini to cache files
FS#2677 support arrays in to, cc, bcc headers in Mailer

This does not fix FS#2677, it only adds support for fixing it later.
added missing default