Fix coincidence naming of LocalCollection members

[sunkup]

Purpose

Remove / Fix the coincidentally equal overlappning names in LocalCollection of the implementing classes (LocalCalendar and LocalJtxCollection) which extend classes, that already have members of the same name (AndroidCalendar and JtxCollection).

• <i>LocalCollection : fun delete(): Boolean
• LocalCalendar : implicit (coincidentally) implemented by
• AndroidCalendar : fun delete(): Boolean

and

• <i>LocalCollection : val url: String?
• LocalJtxCollection : implicitly (coincidentally) implemented by
• JtxCollection : var url: String?

Short description

In LocalCollection rename:

• delete() to deleteCollection()
• url to collectionUrl

Update one log statement to use the new way of acquiring the logger.

Checklist

• The PR has a proper title, description and label.
• I have self-reviewed the PR.
• I have added documentation to complex functions and functions that can be used by other modules.
• I have added reasonable tests or consciously decided to not add tests.

[ArnyminerZ]

Looks alright to me :)

[rfc2822]

Looks good!

I think we have to re-order the methods in LocalCalendar etc. at some time because the order seem quite random.