minor Linux build/compatibility problems
Minor changes to clarify some descriptions.
Used namespaces explicitly to clarify the description.
Updated to match headers
Minor fix - needs to include stdexcept to be complete.
Made heapdebug a separate project - may not release this as part of STLplus
Reworked to avoid macros
Updated to v3.5
Updated with test on MinGW gcc v4.4
Correctly named the ntree component as an Ordered Rooted Tree
