The previous version of tijerasxx silently assumed that time series index
range upon input would start with index zero. When reading data in binary
format (libdatrwxx) the time series index range is provided in data file such
that input time series index range may start with any integer value.

The new version correctly handles these cases by operating in the index range
of the input series when extracting a subset of the series.

Merge branch 'libstfinv_fdlsq' into master

A new taper option for procedures operating in the Fourier domain is
implemenetd in libstfinv. This commit makes the new feature available on
master.

properly distinguish between groups and namespaces

These changes appeared helpful when installing on OpenSuSE Tumbleweed.
Could not make clear whether they are essential...

Merge branch '25-libdatrwxx-miniseed-consistency-checks'

add text regarding "usec" consitency check

Merge branch '25-libdatrwxx-miniseed-consistency-checks'

- when reading the [1001] Data Extension Blockette the usec field may carry a
  sign (see SEED V2.4 Manual, August 2012, page 124)
- introduce a consistency check for usec being in the specified range

On page 124 of "SEED Reference Manual, Standard for the Exchange of
Earthquake Data, SEED Format Version 2.4, August, 2012" with
respect to [1001] Data Extension Blockette (8 bytes):

> field 4: BYTE: µsec has the data start time down to the
>   microsecond. The SEED format handles down to 100µsecs. This
>   field is an offset from that value. The recommended value is
>   from -50 to +49µsecs. At the users option, this value may be
>   from 0 to +99µsecs.

field 4 (usec) of [1001] Data Extension Blockette explicitly is signed an can
be negative (see SEED V2.4 Manual, August 2012, page 124)

Hide unused typedef in ibinarystream::readany to make compiler happy. Leave
statement in a comment, since typedef might be helpful for future code
development (just as a note).

Merge branch '25-libdatrwxx-miniseed-consistency-checks'

Let libdatrwxx output more user-friendly error messages. These messages can
contain more detailed and comprehensive information regarding the cause of the
error message and can provide hints how to handle the situation.

Let the library output a messages which should be meaningful for an end-user
of a program which uses libdatrwxx.