Move battery thresholds to static defs.

This reduces per-prompt overhead a bit, as these
never change, so it was just useless string bashing
and parsing.

tcshrc.prompt.defs

@@ -147,6 +147,14 @@ set host_prompt="${CSHENV_HOSTNAME}"
 set path_prompt="%c02"
 set end_prompt="%#"
 
+# The battery level thresholds are fixed, no need to recompute each prompt.
+set critical_battery_level = 10
+set low_battery_level      = 20
+set weak_battery_level     = 33
+set medium_battery_level   = 50
+set strong_battery_level   = 75
+
+
 alias oldp 'set prompt="$prompt_simple"; set cshenv_user_prompt_override'
 alias newp 'set prompt="$prompt_cool"; unset cshenv_user_prompt_override'
 

tcshrc.prompt.final

@@ -73,12 +73,6 @@ endif
 @ prompt_hcolor = $prompt_hcolor % ${#reference_colors}
 @ prompt_hsym = $prompt_hsym % ${#referencechars}
 
-set critical_battery_level = 10
-set low_battery_level      = 20
-set weak_battery_level     = 33
-set medium_battery_level   = 50
-set strong_battery_level   = 75
-
 
 while( ${prompt_hcolor} == 0 )
 	_debug colorshuffle