Remove xml from comment string generated for Philips from dose info import

[Ed McDonagh]

See ct_philips.py

I think the original intention was to ape the Siemens CT comment. Probably wasn't a good idea.

[Ed McDonagh]

Removed XML styling from comment construction. Refs #520

→ <<cset 5190b5e5d390>>

[Ed McDonagh]

Added note about the change to the release notes, and a description of where some of the fields come from to import docs. Refs #520

→ <<cset 269d268ea612>>

[Ed McDonagh]

Added to changes. Refs #520

→ <<cset acd0088c3c49>>

[Ed McDonagh]

Merged in issue520PhilipsCommentField (pull request #132)

Issue520PhilipsCommentField

Fixes #520

→ <<cset cd6231791ea2>>

[Ed McDonagh]

Fixed in pull request #132