intrinsic functions not yet documented

[Daniel Franke]

> If you have time to write documentation for (some of) these intrinsics,
> it would be a welcome contribution to gfortran! 

I finished merging the list I posted yesterday and the list at the end of the 
texi file which I missed so far. The (for now) complete list of intrinsics 
has 201 entries, 99 of them still to do.

Where appropiate, I would like to introduce an additional "See also" section, 
e.g. 
 * IAnd, see also IOr, IEOr
 * lbound, see also ubound
 * iargc, see also getarg, get_command, get_command_argument
 * ... to be continued

Any objections?

	Daniel