qt: show all units in send confirmation

Make users accustomed to the other subdivision units (mBTC, muBTC)
by showing the total amount in all units in the confirmation dialog.

This was recently raised on the mailing list and could be a preparation
for switching over the default unit eventually.
RPC client option: -rpcwait, to wait for server start
[Qt] make a UI element in sendcoins non-validated

- this was unused for the label and also makes no sense, so remove it
Provide build time when building from tarball:

 When building from tarball (i.g. not from git source tree or when git
 is not available) `genbuild.sh` write undefined $TIME to "build/build.h".

 Even worse, when TIME is set in the environment then its value
 is written instead of a date.

 For me this change fixed FTBFS which I got because I had
 TIME enviroment variable set with format for time(1) utility.
Merge pull request #3283 from gavinandresen/rpcwait

RPC client option: -rpcwait, to wait for server start
Merge pull request #3293 from onlyjob/master

Provide build time when building from tarball:
Merge pull request #3287

67448b2 [Qt] make a UI element in sendcoins non-validated (Philip Kaufmann)
Remove '/': prefix always starts with '/'

brew --prefix retruns a fully qualified path, so using -L/$prefix results in a path with two leading '/'.
cleanup error message consistency

  relicts from the CTransaction refactor.
Merge pull request #3299

c89d59c Remove '/': prefix always starts with '/' (Florin)
Merge pull request #3273

fb0507f qt: show all units in send confirmation (Wladimir J. van der Laan)
Merge pull request #3300

848fe68 cleanup error message consistency (Julian Langschaedel)
contrib: add sipa's github-merge script
Merge pull request #3302

e5adec3 contrib: add sipa's github-merge script (Wladimir J. van der Laan)
Add main-specific node state