Packaging problems: soversion, deps

[leamas]

Trying to package the library, running into multiple problems:

• library lacks so-version
• library lacks compatibility links
• The name serial is too generic and clashes with other packages
• There is no pkg-config .pc file generated.
• The example code is not installed.

Attaching a patch. Unfortunately. it's pretty invasive, but it fixes the listed issues. As a bonus, the catkit deps are present only in the tests, so it's possible to build the library without these deps (but then without tests).

0001-build-Fix-packaging-issues.patch.gz

EDIT: Forgot to mention that the installation paths options are not documented; I was never able to install into proper locations with the original code. New code uses GNUInstallDirs' well-known paths.