remove parasite 1x1 in mails (closes #3731)
include images in mail sent as pdf (closes #3730)

also remove some notices and cleanup code
Merge pull request #724 from cbonnissent/3.2_3726

Correction of autoclose option on IE6
Merge pull request #725 from CircleCode/3.2-I3731

remove parasite 1x1 in mails (closes #3731)
Merge pull request #726 from CircleCode/3.2-I3730

include images in mail sent as pdf (closes #3730)
Log message correction (closes #3723)