Update seismogram writing filenaming convention.

[lsawade]

The current seismogram writing scheme does not follow the <network>.<station>.<location>.<component>.<format>.

Right now, the dots are omitted, leading to ambiguity in the id since network can have 1 to 4 letters and station 2-5 (or six).

To Reproduce

Write any seismogram

Expected behavior

seismogram name to be of the above described format.

What needs to be done?

Update the writer source file writer/seismogram.cpp and all examples/test that write seismograms.

Machine information (please complete the following information):

machine independent