- Fetch the location of the Microsoft Visual C++ compiler(s) from
the Registry, instead of hard-coding the location.
+ - Made Scanner objects take Nodes, not path names.
+ - Have the C Scanner cache the #include file names instead of
+ (re-)scanning the file each time it's called.
+ - Created a separate class for parent "nodes" of file system roots,
+ eliminating the need for separate is-parent-null checks everywhere.
+ - Removed defined __hash__() and __cmp() methods from FS.Entry, in
+ favor of Python's more efficient built-in identity comparisons.