Move the body of the usage function directly to the body of member function
datrw::imseedstream::help()

Place this code in a separate compilation unit.

- pass consistency check values to reading functions
- provide information regarding Mxm1 value which is used to check for data
  value continuity

Let MiniSEEDRecord store consistency check control flags in its own member
data.

- pass flags to inner reading function
- note changes in file headers

Read format modifiers and set flags for consistency checks appropriately.

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

hide

  typedef typename aff::Series<T> Tinseries;

from compiler, because Tinseries is not used. The declaration itself however
might be useful as a reminder of which type the expected series container
should be.

Implement structures to hold control flags for consistency checks.

The only way to properly distinguish between references to the namespace and
the module documentation is by a prefix group_ for the group keyword.

errno is already used by system headers; leads to conflicts

Discard SVN keywords and subroutines which were used to report SVN Id at the
terminal:
- subroutine foucmd_revision
- subroutine foufil_revision
- subroutine fou_revision

So far these subroutines were only called by subroutine foucmd_help
within libfourier itself.

The parameters for the transformation into Fourier domain (selecting the
number of samples to be used) was not defined in detail.

Solve two issues in the MiniSEED module of libdatrwxx:
- do not complain about inconsistent frame count, if number of frames is just
  guessed (issue21)
- read past unused data in each MiniSEED record (issue23)

This way libdatrwxx and all tools based in the library (like any2matlab)
should be prepared to properly read recent EarthDataLogger (EDL) files.