#163 Need ability to expand modules on demand.

[open-speedshop]

06/14/2006(slc) - expand modules on demand in
hash_get_srcObj() similar to what is done in
get_inst_point. Expand() is obviously not a const
member function. This function is, and for data items
there is no pair of separate functions like
get_inst_point()/hash_get_point(). This function is
never called for a const ModuleObj*, so it should be
ok to cast and call at this point in the code. The
alternative would be to create a separate member
function analogous to get_inst_point(). (from Bill
Hachfeld, SGI).