fix: GUI Disappearing #1522 (Mac OSX)

- this solution works stable on mac and ensures that the window get's reopened when the user clicks the dock icon .
- tested on 10.8 with Qt4.8.4 and Qt5.0.1

Signed-off-by: Jonas Schnelli <jonas.schnelli@include7.ch>
added bitcoin-qt manpage and corrected a few minus signs used as hyphens in other manpages
re-remove irc reference in bitcoin.conf.5
small updates for walletview.cpp

- make "&Export" translatable
- fix some includes
- small formatting changes
qt: remove fee recommendation in settings

This value gets stale really quickly, do not hardcode it into a message.
Completely remove it for now.
Later on, a mechanism will be added to determine fees based on the mempool.

Closes #2576
Merge pull request #2582 from laanwj/2013_04_options_fee_recommendation

qt: remove fee recommendation in settings
Merge pull request #2564 from Diapolo/walletview

small updates for walletview.cpp
Merge pull request #2559 from maqifrnswa/manpages

added bitcoin-qt manpage and corrected a few minus signs
Merge pull request #2530 from jonasschnelli/mac_win_reopen_fix

fixes #1522: GUI Disappearing (Mac OSX)