use wrappers from parallel.f90 in smooth_vol_data.f90
Merge pull request #132 from rmodrak-princeton/devel

use wrappers from parallel.f90 in smooth_vol_data.f90
improved a comment
Merge pull request #133 from komatits/devel

improved a comment
updated all the copyright header files
Merge pull request #134 from komatits/devel

updated all the copyright header files
Cleanup C code slightly.
Remove duplicate constants.h file.
Correct licence in several files.
Remove todo file after moving issues to GitHub.
Remove commented code for absorbing boundary snapshots.

It was commented out almost 3 years ago; I don't think it's going to be
reinstated any time soon.
Remove irrelevant comments.

These are just code review; not actually explaining anything.
Remove code-duplicating comments.

These comments duplicate some other code somewhere else. That's just
confusing, plus they're starting to get out of date now.
build: Remove Pyre checks.

The Pyrized version was removed in 2009, so these checks are not useful.
Fix some of the simpler warnings.
Use MPI_STATUS_IGNORE in MPI calls.

The status is not used, so this saves us an extra variable or two. As
suggested by @jedbrown in another PR for Specfem2D.
Combine duplicate get_global subroutines.

These are all the same save for one loop bound. But that nested loop can
be re-written as a single loop that works for all cases.
Combine duplicates of sort_array_coordinates.

This unfortunately causes a bit of extra allocation for unused
parameters. Hopefully I can find a workaraound for that.
Replace Numerical Routines sorting code.

Numerical Routines source code is not re-distributable in any way at all
and is 100% incompatible with the GPL.

The replacement code originates from the heap_sort.f90 in the global
code. It appears to be a fairly straight-forward translation of the heap
sort algorithm (e.g., from RosettaCode) and should be unencumbered. I
have added additional parameters in order to sort multiple arrays at the
same time. Interestingly, this code is slightly faster than the
previous version.
Remove unused constants.