Don't enforce white color, use terminal default instead

Fixes #68

admin/checkservices

@@ -40,7 +40,6 @@ if [[ -t 1 ]]; then
     C_BLUE='\e[34m'
     C_RED='\e[31m'
     C_YELLOW='\e[33m'
-    C_WHITE='\e[37m'
     C_RESET='\e[m'
 fi
 
@@ -57,17 +56,17 @@ USER_SLICE=0        # act on users services
 
 # print $* as an arrow line
 arrow() {
-    printf "${C_BOLD}${C_BLUE}:: ${C_WHITE}%s${C_RESET}\n" "$*"
+    printf "${C_BOLD}${C_BLUE}:: ${C_RESET}${C_BOLD}%s${C_RESET}\n" "$*"
 }
 
 # print $* as an warning message
 warn() {
-    printf "${C_BOLD}${C_YELLOW}Warning:: ${C_WHITE}%s${C_RESET}\n" "$*" >&2
+    printf "${C_BOLD}${C_YELLOW}Warning:: ${C_RESET}${C_BOLD}%s${C_RESET}\n" "$*" >&2
 }
 
 # print $* as an error message
 error() {
-    printf "${C_BOLD}${C_RED}Error:: ${C_WHITE}%s${C_RESET}\n" "$*" >&2
+    printf "${C_BOLD}${C_RED}Error:: ${C_RESET}${C_BOLD}%s${C_RESET}\n" "$*" >&2
 }
 
 # usage : in_array( $needle, $haystack )