Setting IDAPython's module search path via idapythonrc.py

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What steps will reproduce the problem?
1. Add sys.path.append('/path/to/another/pythonpath/directory') to 
get_user_idadir()/idapythonrc.py
   i.e.
   sys.path.append('/path/to/custom-module/')

2. Try to import a module located in the pythonpath from IDAPython's 
commandline.
   i.e.
   import mymodule

3. print sys.path and notice that none of your sys.path that you set in 
idapythonrc.py actually persisted.
   print '/path/to/custom-module/' in sys.path

What is the expected output? What do you see instead?
It is expected that idapythonrc.py could be used to setup the python search 
path in IDA.

What version of the product are you using? On what operating system?
IDAPython 2.0.0

Please provide any additional information below.

The reason why this is happening is because idaapi.IDAPython_ExecScript in 
init.py is being used to execute the user's idapythonrc.py. This function saves 
sys.path and globals, calls execfile, and then restores them after execution. 
Due to this being used instead of execfile, one can't use idapythonrc.py to set 
the default python environment as IDA starts up. To fix, you can change 
idaapi.IDAPython_ExecScript to just execfile inside init.py.

Original issue reported on code.google.com by arizv...@gmail.com on 31 Jan 2015 at 8:57