Help messages correctly formatted (79 chars)

Help messages are formatted programmatically with FormatParagraph
in order not to break existing strings in Transifex.

The new format works even if the translation of the strings
modifies the lenght of the message.

Sqashed 6 commits in a single one.
Help messages correctly formatted for SVGA text mode (132 chars)

Help messages are formatted programmatically with FormatParagraph
in order not to break existing strings in Transifex.

The new format should work even if the translation of the strings
modifies the lenght of the message.

Fix - syntax error

Correct formatting for 79 chars

Correctly based on C++ functions

Removed spare spaces from option strings

Fix - syntax error

src/util.cpp

@@ -346,6 +346,21 @@ bool SoftSetBoolArg(const std::string& strArg, bool fValue)
         return SoftSetArg(strArg, std::string("0"));
 }
 
+static const int screenWidth = 79;
+static const int optIndent = 2;
+static const int msgIndent = 7;
+
+std::string HelpMessageGroup(const std::string &message) {
+    return std::string(message) + std::string("\n\n");
+}
+
+std::string HelpMessageOpt(const std::string &option, const std::string &message) {
+    return std::string(optIndent,' ') + std::string(option) +
+           std::string("\n") + std::string(msgIndent,' ') +
+           FormatParagraph(message, screenWidth - msgIndent, msgIndent) +
+           std::string("\n\n");
+}
+
 static std::string FormatException(const std::exception* pex, const char* pszThread)
 {
 #ifdef WIN32