Merge branch 'release/v2.0.9'

Conflicts:
	exponent_version.php
	framework/modules-1/calendarmodule/class.php
Version bump for 2.1.0
Functional Nested (blog) comments implementation, can be disabled, still could use some styling, esp Reply link [#552]
Adds a pagination option of 'more' to display a single 'More...' link to the showall view instead of pages...good for headlines views. [#738 state:resolved]
Adds per-item comment disabling (blog) [#690 state:resolved]
Add comments to filedownloads with per-item comment disabling, etc... [#752 state:resolved]
dompdf folder removed in prep for submodule
dompdf submodule added
Remove dompdf files?
Updated dompdf files?
basetheme removed to begin submodule conversion
basetheme submodule added
coolwatertheme removed to prep for submodule
coolwatertheme submodule added
multioptionstheme removed to prep for submodule
multioptionstheme submodule added
retrotheme removed to prep for submodule
retrotheme submodule added
Removes the new optional submodules from main repo...submodules should only be in the local repo instead of having them in the main repo since it kind of defeats the 'optional' purpose.
Removes the optional themes submodules