quiet -Winline and -Wshadow warnings
quiet sign-compare warnings

it would be better if these were fixed, but they haven't caused many
probems so far, and unless avoiding these warnings were accepted as policy
by the project, they'd just keep on cropping back up
fix gcc warnings

fixed for -Wunused-variable, -Wwrite-strings, and -Wreorder

also fix c++11-only-style non-static data member initializers, which
older compilers won't support
fix out of bounds error
undo unneeded change
initialize static vars in .h again

now that the vars are static, they no longer need to be initialized in
the .cpp file
Merge pull request #800 from myk002/fix_warnings

Fix warnings
New Feature: Allow Psi-Strength Improvement
Default: OFF