added a buffer session module (session.tes)

This is a simple and straight-forward implementation of
buffer sessions in SciTECO. A session is merely a SciTECO script
that opens files when executed (and restores properties).
The current session is identified by this script's filename in
Q-Register "session.path": ~/.teco_session by default.
Users may set "session.path" to manage different profiles.
An abstraction of session "names" is not provided. Users are expected
to hack these on their own.

For the common task of having one session per profile, the
"session.git" macro is provided. It set's up the current session
relative to the current Git repository.
This will create ".teco_session" files in the root of Git
repositories, that may be added to a global ignore pattern (or they
may even be versioned!)

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