improve usage and help command output

Rewrite formatting code in C, removing last remenants of TCL help code.
Sinificantly improves the readability by using smarter indent and wrap.

src/helper/startup.tcl

@@ -10,40 +10,6 @@ proc exit {} {
 	ocd_throw exit
 }
 
-# Help text list. A list of command + help text pairs.
-proc cmd_help {cmdname h indent} {
-	set indent [expr $indent * 2]
-
-	set fmt_str [format "%%%ds%%-%ds %%s" $indent [expr 25 - $indent]]
-	set w [expr 50 - $indent]
-	set n 0
-
-	while 1 {
-		if {$n > [string length $h]} {break}
-
-		set next_a [expr $n + $w]
-		if {[string length $h] > $n + $w} \
-		{
-			set xxxx [string range $h $n [expr $n + $w]]
-			for {set lastpos [expr [string length $xxxx] - 1]} \
-				{$lastpos >= 0 && [string compare \
-					[string range $xxxx $lastpos $lastpos] " "] != 0} \
-				{set lastpos [expr $lastpos - 1]} \
-			{
-			}
-			#set next_a -1
-			if {$lastpos != -1} {
-				set next_a [expr $lastpos + $n + 1]
-			}
-		}
-
-		puts [format $fmt_str "" $cmdname \
-				[string range $h $n [expr $next_a - 1]] ]
-		set cmdname ""
-		set n [expr $next_a]
-	}
-}
-
 # Try flipping / and \ to find file if the filename does not
 # match the precise spelling
 proc find {filename} {