Keyboard responds badly on some keys (bad symbols output)

[Impact]
The default Czech keyboard layout does not provide mappings for several keys commonly found on actual Czech keyboards. Pressing these keys on the keyboards generally results in incorrect or no symbols being printed.

[Development Fix]
In xkeyboard-config 2.5, which we're shipping in Precise, two patches were introduced to add the missing key definitions.

[Stable Fix]
The two patches apply cleanly to 2.3. I've merged them into a single patch to make the changes easier to review and track.

[Text Case]
1. Attach a Czech keyboard
2. Press the keys uring, uacute, parenright, iacute, eacute.
Broken Behavior: Symbols not matching what's printed on the keys are displayed
Fixed Behavior: Symbols matching the keys are displayed

[Regression Potential]
This is a very safe fix. The change alters only the Czech keyboard configuration file, and only adds key definitions; no existing keys change behavior.

[Original Report]
When I press certain keys, I expect I'll get the keys on the keyboard in my layout, I get bad ones instead though. Even when it is the right keystrokes that work well even in Windows and on Mac, even the symbols are printed on the keyboard. This needs to be patched. Problem is the symbols are mapped on different keys, some symbols have been duplicated. Maybe new keyboard layout should be made, some users sure used to this "buggy" layout. I made a new one where all errors I've found are already corrected. I attach new layout in the patchfile.

lsb_release is not relevant as this problem persists at least for 6 years in every distro I used (Ubuntu, Debian, Fedora, Linux Mint, etc...)

P.S.: The patchfile was made from:

/usr/share/X11/xkb/symbols/cz

Best regards
Lukáš Mojžíš
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DistUpgraded: Fresh install
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