3DLDF User and Reference Manual

MAX_REAL is now the second largest float value. However, the calculation is system dependent, and will only work on 32-bit little-endian architectures. I will start working on porting this soon.
Fixed bug in tsthdweb, that caused files to be compiled more often than necessary. It will be necessary to keep an eye on this.
Added Rectangle::is_rectangular().
Made mediate() a member function of Point.
It is now possible to generate this manual in the Info and HTML formats.