Improve literal numbers in tmbundle highlighting

Add hexadecimal floating point numbers.  Put them ahead of hexadecimal
integers so they get fully matched instead of just the integer part.

Syntaxes/Chapel.tmLanguage

@@ -47,7 +47,7 @@
 		</dict>
 		<dict>
 			<key>match</key>
-			<string>\b((0(b|B)[0-1]([0-1]|_)*)|(0(o|O)[0-7]([0-7]|_)*)|(0(x|X)[0-9a-fA-F]([0-9a-fA-F]|_)*)|((([0-9]([0-9]|_)*\.?([0-9]([0-9]|_)*)?)|(\.[0-9]([0-9]|_)*))((e|E)(\+|-)?[0-9]([0-9]|_)*)?))\b</string>
+			<string>\b((0(b|B)[0-1]([0-1]|_)*)|(0(o|O)[0-7]([0-7]|_)*)|(0(x|X)((([0-9a-fA-F]([0-9a-fA-F]|_)*\.?([0-9a-fA-F]([0-9a-fA-F]|_)*)?)|(\.[0-9a-fA-F]([0-9a-fA-F]|_)*))((p|P)(\+|-)?[0-9]([0-9]|_)*)?))|(0(x|X)[0-9a-fA-F]([0-9a-fA-F]|_)*)|((([0-9]([0-9]|_)*\.?([0-9]([0-9]|_)*)?)|(\.[0-9]([0-9]|_)*))((e|E)(\+|-)?[0-9]([0-9]|_)*)?))\b</string>
 			<key>name</key>
 			<string>constant.numeric.chapel</string>
 		</dict>