Revert "Add add & sub functions to template language"

This reverts commit 6fa9d7b.

Signed-off-by: Christopher Obbard <[email protected]>

actions/recipe.go

@@ -35,8 +35,6 @@ The following custom template functions are available
 - sector: Returns the argument * 512 (convential sector size) e.g. `{{ sector 64 }}`
 - escape: Shell escape the  argument `{{ escape $var }}`
 - decimal: Returns the integer argument as a decimal integer e.g. `{{ decimal 0x40 }} => 64`
-- add: Returns the calculation of two integer arguments `a + b`, e.g. `{{ add 1 1 }} => 2`
-- sub: Returns the calculation of two integer arguments `a - b`, e.g. `{{ sub 10 1 }} => 9`
 
 Mandatory properties for recipe:
 
@@ -163,14 +161,6 @@ func decimal(i int) int {
 	return i
 }
 
-func add(a int, b int) int {
-	return a + b
-}
-
-func sub(a int, b int) int {
-	return a - b
-}
-
 func DumpActionStruct(iface interface{}) string {
 	var a []string
 
@@ -259,8 +249,6 @@ func (r *Recipe) Parse(file string, printRecipe bool, dump bool, templateVars ..
 		"sector":  sector,
 		"escape":  escape,
 		"decimal": decimal,
-		"add":     add,
-		"sub":     sub,
 	}
 	t.Funcs(funcs)