Removed src/segments* from manifest

See merge request !56

Updated README

Closes #9

See merge request !52

Removed gw_data_find

See merge request !57

Updated CI

See merge request !60

- use new macro for python3 version
- added missing `gcc` and `make` dependencies

and tweaked binary package building

- use markdown formatting
- just provide installation instructions and link to website

causes issues with bdist_egg installs

Removestubs

See merge request !59

- I don't hvae a test environment to confirm that this patch is correct,
  someone who can reproduce the problem will have to check

- obsolete stub, original now in gstlal

- obsolete stub, moved to lalburst

- a few last places that refer to glue.segments and glue.segmentsUtils are updated
- the subpackage is removed from the packaging scripts

- re-enable unit tests for table, lsctables and utils.segments

- test environment in git.ligo.org is incomplete

- glue's test environment on git.ligo.org is incomplete

- the environment in which these tests are run in git.ligo.org seems to be permanently broken.

- I did tests in the command line interface that made it seem like using
  stdin as a context manager would not close stdin, but when you do it in a
  program stdin gets closed, which we can't have.

Various Python 3 compatibility fixes

See merge request !55

- close files
- see !58

- for better performance in gstlal inspiral pipeline

- even if the descriptor protocol documentation says to.

- dagfile goes to gstlal
- offsetvector goes to lalburst
- segmentsUtils goes to ligo.segments
- deprecation warning stubs are left in their place

- the transition to python-ligo-lw is now complete, with that package being
  in production and installed LDG-wide

- this patch removes ligolw_add, ligolw_cut, ligolw_print, ligolw_sqlite from
  bin/ in the glue source tree, and eliminates the "glue-ligolw-tools"
  sub-package from the packaging scripts

- test scripts used for verifying the four tools are also removed

Bug Fix to remove M2Crypto

See merge request !54

(cherry picked from commit 06238141)

This work in python 3 otherwise markup fails

See merge request !51

Updates to license distribution

See merge request !53