Checking for single char line endings

This fixes problems with IRC servers sending only single char line
endings. Before the last char on each line for thos servers would be
chopped, now Quassel checks how the line ends and chops accordingly.
Fixes #1267
Fix Bug #1293: --syslog option writes to emergency level
Fix Bug #1293: --syslog option writes to emergency level
Use correct nick on 001 RPL_WELCOME

Fixes #1020
When the user connects to  a bouncer, the bouncer will send back the
welcome message received when it first connected to the network.
This caused Quassel to display a wrong nick if it had changed
since the first connection.
Fix MainToolBar visibility not saving in OSX

The current code, although completely valid, doesn't work due to moc not
seeing built in defines. See;
https://bugreports.qt-project.org/browse/QTBUG-34593
Retains Channel UnHiddens Status after client Restart.

Steps to Reproduce:
1. Hide channel temporarily
2. Part channel
3. Join channel (it will now be visible again, at the bottom of that network's buffer list)
Optional: talk in the channel, get other people to talk, etc but the buffer must not be blue (new message(s)) when you proceed next
4. Quit the client
5. When you'll restart it, the channel will be temporarily hidden again

Root Cause:
After step 3, we are not saving the bufferviewconfig synchronizable object right.

Fix:
Save the bufferviewconfig object correctly.

Fixes #1218.
Update README re: manageusers.py

Update README to reflect the deprecation of scripts/manageusers.py in Aug 2010
Use null QVariant instead of "ALL" for select limit on psql

Using "ALL" as it was before was making PostgreSQL error out when
attempting to return backlog for Quasseldroid when Quasseldroid is
in "Unread messages per chat" mode.  According to
http://www.postgresql.org/docs/9.3/static/queries-limit.html,
LIMIT NULL is the same thing as having no LIMIT at all.  According
to http://qt-project.org/doc/qt-4.8/qsqlquery.html, NULL values
are bound in Qt SQL prepared statements by using a null QVariant.
Update AboutDlg
Update ChangeLog