Add suffix and removesuffix filters
Fix for removesuffic operator
Revert incorrect refreshing of tiddler widget

Mistakenly, I had changed the tiddler widget to refresh itself when the
value of the target tiddler changed. This is not in fact necessary; it
only needs to refresh itself when the identity of the target tiddler
changes.

Fixes #744
Fix tiddler info default tab

Mistakenly omitted from b437f1b450f5f2a3104a9086f7c674299b53b9bc
Make prefix/suffix operators be case sensitive

I think it was a mistake for them to be case insensitive in the first
place.

https://groups.google.com/d/topic/tiddlywiki/dzpFsRCC5D8/discussion

If case insensitivity is required then regexps can be used instead.
Release note update
Removed unneeded CSS classes

Part of #764
Rename "titlebar" class to "tc-titlebar"

Part of #764
Rename "title" class to "tc-title"

Part of #764
Rename "story-river" class to "tc-story-river"

Part of #764
Rename "sidebar-header" class to "tc-sidebar-header"

Part of #764
Merge remote-tracking branch 'upstream/master'
Rename "btn-invisible" class to "tc-btn-invisible"

Part of #764
Rename "btn-icon" class "tc-btn-icon"

Part of #764
Rename class "btn-big-green" to "tc-btn-big-green"

Part of #764
Rename "modal-*" classes to "tc-modal-*"

Part of #764
Rename "tw-password-wrapper" class to "tc-password-wrapper"

Part of #764
Rename "tw-error-*" classes to "tc-error-*"

Part of #764
Rename "tw-image-*" classes to "tc-image-*"

Part of #764
Rename "tw-tiddlylink-*" classes to "tc-tiddlylink-*"

Part of #764