Add a merge functionality to logData

[baubakg]

We should be able to merge two LogData objects.

Rules:

• Both Log Data need o have the same keys (ParseDefinition keys)

Actions. For a LogData "A" with ParseDefinition "a", and a LogData "B" with ParseDefinition "b" (B into A):

1. Enrich ParseDefinition "a" with that of "b"
2. For each added ParseDefinitionEntry: 2.1. Set it to optional

Merge rules:

• If key matches : increment existing, ignore optional values - send warning
• If if key is new : add values