all: change my email, leftover from previous ISP

That company has outsourced their mail service to Hotmail(TM), hence
making it unusable. Now, using my Linux User's Group servers, with the
priceless support of the Hellug sysadmin Team. Thank you!
user-backup: support "xz" compression

It is fast and very efficient, it can replace the standard "gzip" one
backup-encrypt: fix typo that broke file selection

The dot appeared twice in the file pattern.
README: add some notes to other people

Some folks seem to be interested in this project, let them know what
it is and how it works. :)