medical 2.2.1 2.2.1 Switch to the latest release

I'm happy to announce the GNU Health maintenance release version 2.2.1
with the bug fixes for the stable version; enhancements to the
installation script; and introducing Patchsets for stable / production
versions.

** Bug Fixes / Tasks **

* health
-> bug #40128 :Reporting Traceback when specialty is null .
https://savannah.gnu.org/bugs/?40128

* health_services
-> bug  #40165 : Generate draft invoices per line of service
https://savannah.gnu.org/bugs/?40165

* GNU Health Installer
-> bug #40171 : Unmet dependency error of package "six" removed from qrcode
https://savannah.gnu.org/bugs/?40171
-> bug #40169: Backward incompatibility using --pre option of pip command
https://savannah.gnu.org/bugs/?40169
-> Task #12882: Add BASH aliases for improved navigation
https://savannah.gnu.org/task/?12882


** Introducing Patchsets **
Since this version, 2.2.1, we begin to provide "patchsets" to stable
releases (even minor number). This allows quick bug fixes and updates
for production systems.
Patches and Patchsets maximize uptime for production systems, and keep
your system updated, without the need to do a whole installation. Some
of them, and thanks to the magic of Tryton can be applied to running
system, so could have 24x7 availability.

** Patchset 2.2.1 : Installation Notes **

* Follow the general instructions at
https://en.wikibooks.org/wiki/GNU_Health/Patches_and_Patchsets

* Patchset 2.2.1 specific instructions
-> Modules affected : Health (report), health_service (wizard)
-> Needs trytond update : No

Please send your comments and suggestions to health@gnu.org