F deprecate yamlapi

Summary

The yamlapi should be obsolete in future (see Issue #62 (closed)). Warnings to all functions of this API were added.

Focus

All changes were made in the yamlapi. Tests for the warning were added.

Test Environment

tox

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src/caosdb/yamlapi.py

@@ -22,9 +22,7 @@
 # ** end header
 #
 
-""" YAML interface for the database (caosdb) 
-    !!! Deprecated !!! """
-
+"""!!! Deprecated !!! YAML interface for the database (caosdb)"""
 
 import yaml
 from lxml import etree
@@ -102,7+100,7 @@
     """
     return dict_to_xml(yaml.load(yamlstr))
 
 
 def process(text):
     """Do some replacements on the original file to obtain valid yaml."""
     warnings.warn("""