Fix memory leaks for goma parallel with and without new brk and fix
Save and restore Element_Blocks when when brking and fixing

Needed because of the current rd_exo allocates the Element_Blocks array and needs to be allocated and free'd for each exodus database read.
Merge pull request #50 from wortiz/mem-leaks

Fix memory leaks in parallel runs
Merge branch 'master' into mumps-support