Allow any SMTP server

Config entries for SMTP server, username, use SSL
Added smtp details to readme
Additions to SMTP / EMail

Allow different from/to addresses
Allow multiple recipients
Allow tls & port to be set.
More tweaks to EMail...

Set default settings to suit GMail
Correct transition directly from down to up trend

Reset duration when we go from up to down or vv
Merge pull request #135 from djmuk/localDB

Minor correction to MACD logic & email tweaks