Add alternate path for manpages that conflict with man pages from /bin tools

[IgorTodorovskiIBM]

If you have one of the conflicting tools installed, like coreutils, performing a man on them will result in the following error:

man df
FSUMF061 Cannot format /usr/local/zopen/usr/local/share/man/man1/df.1

The workaround is to use a function like so:

function oldman
{
 (export MANPATH=/usr/man/%L; /bin/man $1)
 }

oldman df

We should also move the man pages to a altman or zotman directory similar to what was done for bin.

[AnthonyGiorgio]

Would it make sense to have a prefix on the command name, so that man gsed works? That way it would be a better out-of-the-box experience.

[lbdyck]

that would depend on if the altbin is active or not and if active then perhaps having an altman is also required.