Improve mUzima setup wizard using Configuration file

Currently, the process of setting up mUzima is manual, in the sense that users have to manually choose cohorts, forms, locations, providers and concepts. This process is repetitive/tiring for an implementation that downloads same sets of data on multiple devices, and is not easy/intutive for new users. An improvement is to create a configuration that allows defining at server side all data to be downloaded, and therefore users only need to pick a preferred config in order to complete the setup wizard.

The proposed workflow

1. On the server-side:
   1. provide facility to create a config file, ideally a drag and drop page. The config file will specify: (forms to download, locations, providers, cohorts, concepts to download, numbers of obs to download) See sample config: sample_config.txt
   2. Forms to have metadata downloaded together with the form (eg concepts to download) (see MUZIMA-419)
   3. For every Concept, optionally specify the number of Obs to download, default all.
2. On the client side, provide two options for the setup wizard:
   1. Recomended: where users select a configuration
   2. Advanced: where users follow the current workflow