Update michagogo's gitian pgp key, adding UIDs
Documentation Cleanup in /Doc

Added some help text, and bumped version numbers.

Added a Readable Index for /Contrib

Fixing /Contrib Index URLs

Revert Version Numbers.
Reimplement CBlockLocator's chain-related logic in CChain.

This removes a few unused CBlockLocator methods, and moves the
construction and fork-finding logic to CChain (which can do these
more efficiently, as it has a height-indexable chain available).
It also makes CBlockLocator independent from the validation code.
Move CBlockLocator to core.h

As CBlockLocator is a P2P data structure, and independent from the
validation logic, it can be moved to core.
make BitcoinAmountField::setReadOnly() usable

- use it for secure payment-requests (this change allows a copy&paste of
  the amount and looks a little nicer than just a disabled GUI element)
doc: remove readme-qt.md

Now that autotools is used as a build system there is nothing
special about building the GUI anymore. Merge the salvageable
parts into build-unix.md
doc: build with qt5 is currently not possible

Add as a separate commit so that it can be easily reverted once
Qt5 is supported again.
Merge pull request #3083 from sipa/chainlocator

CBlockLocator improvements & move to core
Merge pull request #3092 from laanwj/2013_10_remove_readme_qt

doc: remove readme-qt.md
Merge pull request #3086 from Michagogo/update-pgp

Update michagogo's gitian pgp key, adding UIDs
Merge pull request #3085 from super3/master

Documentation Cleanup and Contrib Index
Broken Link in /Doc README

#3092 removed readme-qt.md, but it was still listed in the index for the /doc README.
Merge pull request #3097 from super3/master

Broken Link in /Doc README
Merge pull request #3094 from Diapolo/btcamountfield

make BitcoinAmountField::setReadOnly() usable