Update e-mail for Theodoros Foradis.

* .mailmap: Add entry.
* gnu/packages/aspell.scm: Replace theodoros.for@openmailbox.org with current address.
* gnu/packages/compression.scm: Likewise.
* gnu/packages/electronics.scm: Likewise.
* gnu/packages/engineering.scm: Likewise.
* gnu/packages/fpga.scm: Likewise.
* gnu/packages/graphviz.scm: Likewise.
* gnu/packages/guile.scm: Likewise.
* gnu/packages/libusb.scm: Likewise.
* gnu/packages/maths.scm: Likewise.
* gnu/packages/messaging.scm: Likewise.
* gnu/packages/uml.scm: Likewise.
* gnu/packages/wxwidgets.scm: Likewise.

Signed-off-by: Ludovic Courtès <ludo@gnu.org>