Bitcoin-Qt: small updates to project file

- add new bitcoind.cpp to OTHER_FILES to be able to see it in the Qt
  Creator IDE
- remove a Mac-only header from the general HEADERS, as it is already in
  macx:HEADERS
Merge pull request #2746 from Diapolo/pro-file

Bitcoin-Qt: small updates to project file
qt: Add total balance in overview page
Create parent directories if needed in GetDataDir

One-line change. Fixes #2752.
Merge pull request #2754 from laanwj/2013_06_create_data_dir

Create parent directories if needed in GetDataDir
Merge pull request #2749 from laanwj/2013_06_addtotalbalance

qt: Add total balance in overview page