Show simple Schema-Form to enter values

SPR-291

Add rollback query if a previous method fails

Make more internal SchemaData functions protected

makes SQL builder function a proper protected method

It simplifies the method's signature (page, table and ts do not need to
be passed) and streamlines the input (singles and multies are now the
sam

makes SQL builder function a proper protected method

It simplifies the method's signature (page, table and ts do not need to
be passed) and streamlines the input (singles and multies are now the
same format). Testing has been adjusted using a derived class in the
test namespace

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made autoloader function static

this makes it easier to reuse in testing

Update function comments

Save data to the database

moved tid to AbstractBaseType

it makes more sense there than in the Column

Instantiate sqlite in setup, not in the test

SPR-290

Join data from multivals table and consolidate

Fix tablename

adds a multivals table

for columns that store multiple values (multi = true), we store a NULL
in the data_* table and put all the values in the multivals table. The
row column acts as a simple count

adds a multivals table

for columns that store multiple values (multi = true), we store a NULL
in the data_* table and put all the values in the multivals table. The
row column acts as a simple counter so values can be stored and
retrieved in the correct order.

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Add requirements.txt for travis-ci

SPR-290

Fix PHP-Strict Warning

The warning was about passing only variables by reference.

Fix array keys to match actual form-input names

Add tests for the SchemaBuilder-Class

SPR-290

Fix test coverage information

SPR-290

only one select is needed here

some adjustments to the basetype methods

added new class to manage page's struct data

fixed method signatures

enforce lower case table names

properly handle data column creation

since we want to skip empty column names we need to create the data
columns one by one as well.

added JSON editor

This makes editing the configuration for fields nicer. Types have to
define a complete (possibly empty) default structure and the editor
allows to edit it then.

resorted code a bit

This separates the actual data holders from their editing tools.