Merge pull request #120 from nickanderson/3.5

Backport updates to git integration
Remove unhelpful tags from overview pages
(cherry picked from commit 050b80fe61ca488e5475df1cf0b6c9a27983dff2)
Add instructions for installing git from EPEL
This is helpful for EL5 based distros.
Merge pull request #127 from nickanderson/3.5-git

Add instructions for installing git from EPEL
Improve description of steps for git integration
Because we are doing things from multiple machines it helps to
specifically call out which machine a specific step is to be done from.
Merge pull request #129 from nickanderson/3.5_git

Improve description of steps for git integration
Document automatic linking from keywords
(cherry picked from commit 7f5348a7670fe973a31684de284f200599794e57)
RM #2419 added detail on listening to IPV6 interfaces.
(cherry picked from commit 65a691a0f6d7a7c863e488fa0b6b34ab7bdda053)
Update documentation to explain behavior when process_result is empty.

This updates as per fixes made for #3224
(cherry picked from commit 833b2439363337d26ce4b8cc36a9cbbde1002f31)
Document the need for curl.
Internal links without page name?
(cherry picked from commit 2112c050f7a25627bc1d8fc6b53b1c22b96f7a31)
few typo and formatting fixes

(cherry picked from commit a1f08a428d78f33d4e2baa972697bebad716bf40)

Conflicts:
	manuals/design-center/integrating-mission-portal-with-git.markdown
Add cheatsheet

(cherry picked from commit 8d7d943ca0b8263241c44da9683b4012ddd8aa96)
(cherry picked from commit bc3ddf0b8bd54f7a73e42d4cb6960d66ce4b22ff)
No need to escape

(cherry picked from commit aa48105cc42f82b4a504ea710e7185320bf654a3)
 is actually not a keyword

(cherry picked from commit 2006b21d3bb18123041582f8cbca26be56486888)
Include table example.
Fix link in code block to the real thing.

(cherry picked from commit 38b6f5e3a0570083d244fbf0232e66ee84f522ea)
More cheating

(cherry picked from commit 9a3176d55b0f6815a268c5bf2bcb6042b77f3147)
auto-linking for functions

(cherry picked from commit a7ad1efeaf5bf5f54bce53e3e83add1badeda366)
Document db migration script for upgrade to 3.5.2