Mathmaker

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* Patch the daemon to let it accept the new YAML sheet names.
* The output dir will always be in user's home.
* Fix several bugs.

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* Added a setting to let the user change mathmaker's path (to be used by the daemon)
* Bugfix [0.7.0-5 (2016-08-19)]
* If an IP address is passed as parameter to mathmaker's daemon, it will return a 429 http status code (too many requests) if the last request from the same address is not older than 10 seconds. [0.7.0-4 (2016-08-19)]
* Fixed the install of locale files and font listing file [0.7.0-3 (2016-07-18)]

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* Add mental calculation sheets for fifth level ("yellow belt, 2d stripe")
* Add mental calculation sheets for sixth level ("orange belt")
* Automatically adapt LaTeX preamble, depending on packages really required to compile the document
* mathmaker project moves to gitlab.com

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* Add mental calculation sheets for fourth level ("yellow belt, 1st stripe")

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* Add mental calculation sheets for third level ("yellow belt")
* The mental calculation pdf may now be "interactive" (answers can be written in text fields, they can be validated pushing a button; this validation is done by some javascript)
* The daemon now accepts an optional argument in the request (written right after sheet's name, separated with a '|'. Only interactive is allowed, so far)

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* Support for python3.6 only, drop support for older python versions.
* Mental calculation sheets can now be created as slideshows. Add a default slideshows series for white belt, 1st and 2d stripes.
* Reorganization of mental calculation in belts: White belt, 1st stripe and 2d stripe have been added (including new sheets: addition/subtraction, fraction of a rectangle, complements)
* New sheet: order of precedence in operations.
* YAML files will be used to store sheets. The previous ways (XML and Python) will be dropped.
* Huge reorganization of the lib/ source code.
* Fair bunch of bug fixes.
* Issue warnings instead of exceptions when the version of a dependency could not be determined. [0.7.1dev5 (2017-05-04)]
* New sheets about trigonometry: [0.7.1dev4 (2017-05-03)]

- vocabulary in the right triangle
- write the correct formulae
- calculate a length
- calculate an angle

* New sheets: [0.7.1dev3 (2016-10-21)]

- intercept theorem: "butterfly" configuration
- intercept theorem: converse

* New sheets: [0.7.1dev2 (2016-10-13)]

- expansion of simple brackets (declined in two versions)
- clever multiplications (mental calculation)
- intercept theorem: write the correct quotients' equalities
- intercept theorem: solve simple exercises

* A new sheet (declined in two versions): expansion of double brackets. Defined in an xml sheet as for mental calculation sheets. [0.7.1dev1 (2016-09-14)]