Use BindGlobal more

[fingolfin]

The combo DeclareGlobalFunction plus InstallGlobalFunction exists
to deal with cases where functions must be declared before being used.
This is not the case here, and then using BindGlobal is simpler
and preferable.

[LeonidPryadko]

Thanks @fingolfin

[LeonidPryadko]

This replacement also resulted in documentation removal for each function from the manual created using AutoDoc package.
As a temporary solution, adding a commented line # DeclareGlobalFunction("FunctionName");
just before BindGlobal("FunctionName",...) causes documentation to reappear for FunctionName().
@fingolfin , I think this may be a bug in AutoDoc.