FileReader: added possibility to drag&drop files. Refactoring and stylystic fixes. 

When double clicking on a channel to set fullscreen, the channel height
was set to 0 because the textbook wasn’t set to a correct selected
index. This now gets the value from the text, so it should work
regardless of how the value was entered.

Modifed RHD2000 interface to allow configuration of sync signal

Fixed: Changing data directory in GUI did not take effect if a record…

Fixed: Changing data directory in GUI did not take effect if a recording had been started (and stopped) before. Only the first directory before the first recording was used. Fixed: EventBroadcaster was linking to Debug version of open-ephys.lib in Release mode

added functions getRecordingNumber and getExperimentNumber to CoreServcies. Extended NetworkEvents plugin to send this upon request

Fixed: Changing data directory in GUI did not take effect if a recording had been started (and stopped) before. Only the first directory before the first recording was used. Fixed: EventBroadcaster was linking to Debug version of open-ephys.lib in Release mode

added functions to network module to retrieve acquisition/recording status and the current recording path

- Also, changed Clock divider level: label to Clock divide ratio:
- Also, clock divide settings are now serialized to the configuration
  XML during a settings save.

- Sync signal, wired to BNC out with the update rhd2000.bit, can be set
  to a multiple of the sample clk period using the RHD2000Editor
- This commit corresponds to this pull request:
  https://github.com/open-ephys/rhythm/pull/11