Issue:
When sending JSON in the body of a POST
request from an HTML form - for creating
a new record, a new record was being created,
but with null as the value for all the fields,
instead of the values supplied.

Cause:
The template text in the textarea field, in the
HTML form had some leading whitespace. On looking
through the source, json_decode is being called
only if the first character of the $data variable
is a '{' or a '['.

JSON Specification RFC4627
https://tools.ietf.org/html/rfc4627#section-2

says that insignificant
whitespace is allowed before or after any of the
six structural characters - '{','[',']','}',':',','

where whitespace is defined as:
ws = *(
                %x20 /              ; Space
                %x09 /              ; Horizontal tab
                %x0A /              ; Line feed or New line
                %x0D                ; Carriage return
            )

Fix:
trim the above characters from the beginning and ending
of the received data before checking that the first
character is a '[' or '{'

Update api.php to fix API documentation

Updated the Delete command in the core.php file

Removing DBs as services

Making mysql and postgres test suites adaptable