Convert scripts to entry_points

This MR converts all of the scripts previously managed in bin/ into entry points constructed from code now managed as modules in the new dqsegdb.tools subpackage.

Using entry points rather than scripts has a few advantages

• much easier to test functions in the code independently of the whole
• much easier to measure coverage
• entry points are more portable (easier to install on non-Unix platforms, for example)
• allows for a noarch: python conda package (niche benefit)

This should have no impact on the functionality or usability of any of the current scripts.

dqsegdb/tools/ligolw_dq_query.py

-#!/usr/bin/env python3
 # Copyright (C) 2014-2020 Syracuse University, European Gravitational Observatory, and Christopher Newport University.  Written by Ryan Fisher and Gary Hemming. See the NOTICE file distributed with this work for additional information regarding copyright ownership.
 #
 # This program is free software: you can redistribute it and/or modify
@@ -49,7 +48,7 @@ import json
 
 from six.moves.urllib.parse import urlparse
 
-PROGRAM_NAME = sys.argv[0].replace('./','')
+PROGRAM_NAME = f"{__spec__.name.rsplit('.', 1)[-1]}_dqsegdb"
 PROGRAM_PID  = os.getpid()
 
 try:
@@ -77,7 +76,7 @@ __verbose_msg__ = "version: " + get_versions()['version'] + "\nfull-revisionid:
 #
 
 
-def parse_command_line():
+def parse_command_line(args=None):
     """
     Parse the command line, return an options object
     """
@@ -86,7 +85,8 @@ def parse_command_line():
         version = "Name: %prog\n" + __verbose_msg__,
         #version = "Name: %%prog\nVersion: %s" % get_versions()['version'],
         usage       = "%prog [ --version | --segment-url ] options gps-time1",
-        description = "Provides a report of known and active flags from the segment database for a given GPS time, with a configurable window."
+        description = "Provides a report of known and active flags from the segment database for a given GPS time, with a configurable window.",
+        prog        = PROGRAM_NAME,
 	)
 
 
@@ -106,7 +106,7 @@ def parse_command_line():
     parser.add_option("-f", "--tom-formatting", action = "store_true", help = "Tom Dent requested formatting option: condensed output into single lines.")
     parser.add_option("-b", "--seperate-good-from-bad", action = "store_true", help = "Seperates flags marked by the database as being active when the ifo is in a bad state from those that are active when the ifo is in a good state.")
 
-    options, time = parser.parse_args()
+    options, time = parser.parse_args(args=args)
 
     # Make sure we have required arguments
     if options.segment_url:
@@ -291,8 +291,9 @@ def get_full_name(ifo, name, version):
 # =============================================================================
 #
 
-if __name__ == '__main__':
-    options, database_location, time  = parse_command_line()
+
+def main(args=None):
+    options, database_location, time  = parse_command_line(args=args)
 
     o=urlparse(options.segment_url)
     protocol=o.scheme
@@ -474,4 +475,5 @@ if __name__ == '__main__':
         fh.close()
 
 
-
+if __name__ == "__main__":
+    sys.exit(main())