soft delete database and slsdashboard changes

Email:  Reply-To feature added

See merge request !108

Add: Pack bucket and lazy writing indexes

See merge request !107

1. Fix: Data updated but error thrown because of deleted records.

replyTo feature added

1. Fix: Atomic file not updated, Hard link issue.
2. Add: Create temp directory if not present at app root.

now we dont have to specify each index field in selector to update record

Fix: Bad connection error on mysql connection reset.

See merge request !105

1. Fix: Bad connection error on mysql connection reset.

1. Fix: Data not updated because of safe write

1. Fix: Bucket id generated for existing bucket

1. Add: FileType key constant

Resolve conflicts

Delete function wrapper and function name changes

1. Add: Use custom save function for lazy writer

1. Add: Logs and comments

1. Add: Lazy writer support to write index files.
2. Fix: Index JSON not updated in case of update data.

Coremongo package update

See merge request !103

Coremongo package update

Fdb feature special bucket

See merge request !101

downloadhelpermdl: Export struct and check for "Last-Modified" header

See merge request !100

get open and role base activity pointer function added

Closes MKCLOS/coreosv3/corestudio#92

See merge request !99

Error code and error addition in grpc response

See merge request !97

Error code and error addition in grpc response