Group submissions of requests to operations queue.

This is a follow-up on issue #348 : grouping the requests submissions greatly reduces the number of notifications being posted when the operation queue switches between empty and non empty state.
Merge pull request #354 from barijaona/bugfixes

Follow-up to issue #348 : group submissions of requests to operations queue.
Modified workaround for repeating guids

As discussed at <<http://forums.cocoaforge.com/viewtopic.php?t=26612> : the Netflix feed does not include dates, and has the last movie repeated in the feed. So a guid value is duplicated within the feed, which is invalid.
Other problematic feed, like this one <http://depeches.orange.mg/fluxrss.xml>, have duplicate guids and ambiguous titles and links ; but the date can be usefully used to discriminate between different articles.
Fix issue #348

Make sure that we are really handling a refresh of feeds (and not another kind of network activity) before posting a MA_Notify_RefreshStatus notification
Merge pull request #357 from barijaona/issue-348

Fix issue #348
Merge pull request #355 from barijaona/bugfixes

Fix repeating articles issue with the Netflix feed
Fix column order and dimensions not being remembered

Reverting commit b259ad9f3c7a4e718449a858a3b3302703f71d4b plus additional changes to fix issue #356
removed stringByAppendingPercentEscapesUsingEncoding as the purpose of this method is to encode strings that are going to be part of a URL, e.g. a search query string.
Merge pull request #358 from barijaona/bugfixes

Fix issue #356

tested OK on Snow Leopard and Yosemite
Don’t offset the cell text if it is very long

Re-fix issue #307
This gives satisfactory display of both http://www.baenebooks.com/stanza.aspx?feed=free and http://feedpress.me/sixcolors?type=xml in article list (both in Vertical and Horizontal layouts).
Merge pull request #361 from barijaona/bugfixes

New fix to issue #307
applied string escape fixes to -(void)fixupRelativeIframeTags and -(void)fixupRelativeImgTags
Merge pull request #359 from josh64x2/issue-351

fix for issue #351 aggressive URL encoding
Upgrade version number to 3.0.0 RC 9
added check for webPane isLoading before telling it to stopLoading
Merge pull request #368 from josh64x2/issue-367

added check for webPane isLoading before telling it to stopLoading
Fix problem w/ heavy spinning animations when updating (issue #373).

Updates the appropriate flag immediately after the folder refresh is done.
Various optimizations of folders’ NSProgressIndicator
Merge pull request #378 from barijaona/bugfixes

Fix issue #373
Added Classy style (contributed by user PMP on cocoaforge)