vchoi_fork

[svn-r22233] Description:
    Correct several errors in fractal heap code: root indirect block was
getting pinned/protected more than once, "single" free space sections weren't
getting "re-parented" correctly when the heap transitioned between having a
root indirect block and a root direct block, and several related issues.  Also
cleaned up some warnings in library/tests.

Tested on:
    FreeBSD/32 8.2 (loyalty) w/gcc4.6, w/C++ & FORTRAN, in debug mode
    FreeBSD/64 8.2 (freedom) w/gcc4.6, w/C++ & FORTRAN, in debug mode
    Linux/32 2.6 (jam) w/PGI compilers, w/default API=1.8.x,
        w/C++ & FORTRAN, w/threadsafe, in debug mode
    Linux/64-amd64 2.6 (koala) w/Intel compilers, w/default API=1.6.x,
        w/C++ & FORTRAN, in production mode
    Mac OSX/64 10.7.3 (amazon) w/debug