Improve word parser.

- allow ~ in filenames
 - -8.2.1 now is '-' and '8.2.1' instead of '-8.2' '.' '3'
 - '.text' now is not a file

contrib/tsearch2/wordparser/parser.h

@@ -19,6 +19,8 @@ typedef enum
 	TPS_InUDecimal,
 	TPS_InDecimalFirst,
 	TPS_InDecimal,
+	TPS_InVerVersion,
+	TPS_InSVerVersion,
 	TPS_InVersionFirst,
 	TPS_InVersion,
 	TPS_InMantissaFirst,
@@ -52,7 +54,9 @@ typedef enum
 	TPS_InHost,
 	TPS_InEmail,
 	TPS_InFileFirst,
+	TPS_InFileTwiddle,
 	TPS_InPathFirst,
+	TPS_InPathFirstFirst,
 	TPS_InPathSecond,
 	TPS_InFile,
 	TPS_InFileNext,