* Fixed lsmod calling on systems different from Linux.

* fbterm check now runs only on Linux and if lsmod is available.
* Added OS and OS_RELEASE vars.
* Themes now should also ends with .zsh.

zsh/prompts/pztrn.zsh

@@ -39,7 +39,7 @@ prompt_pztrn_setup () {
 
     [[ -n "$WINDOW" ]] && p_win="$WINDOW"
 
-    if [[ $USER == "root" ]]; then
+    if [[ "$USER" == "root" ]]; then
         vars['usercolor']="%{$fg[red]%}"
     else
         vars['usercolor']="%{$fg[blue]%}"