ChainTipper Release 1.0-beta16

1.0-beta16:

• better error handling in reddit poll loop (recover from connection issues)
• improve amount parser ("1 cent." now works, for example)
• better info when autopay fails on wallets with pw
• simplify tiplist (remove unneeded columns)
• "tip amount text" fixed for <currency_symbol> (was empty)
• "ChainTip" column -> "Stealth" column (only showing "" or "")