Mseedindex

- Set SQLite busy timeout to 10 seconds to allow for graceful
multi-process access to the database (e.g. parallel usage).
- Set HAVE_USLEEP=1 for SQLite build to allow timeout loops to
iterate with sub-second intervals.

- Update libmseed to 2.19.2.
- Update sqlite to 3.17.
- Update to table definition with timerates and format fields, hereby
known as schema version 1.0.
- Update doc/database-schema.txt to version 1.0 and generalize.
- Change default database name from iris to timeseries.

- Update libmseed to 2.18.
- Update sqlite to 3.15.
- Change license to LGPLv3 and add LICENSE.txt.
- Add doc/mseedindex.md, a translation of the man page to markdown.

- Require -table argument and one of either -pghost or -sqlite.
- Add capabilty to synchronize with SQLite3 databases.
- Refactor internals for reduced mixing of database interactions.
- Allow building without PostgreSQL support by setting WITHOUTPOSTGRESQL.

- Add extent time range for the queries that search for and delete rows
based on filename. The time range criteria can be used by the database
for more efficient searching.

- Update libmseed to 2.16.
- Database schema change: replace timerange field with starttime,endtime
- Resolve absolute paths for input files and store them by default. A new
command line option of '-kp' can be used to keep the original paths.