fixed cmake for proper install target

Bind IP addr, Regex-based IMSI-slice assoc., NetStore, bugfixes

* Bind to configurable NB/SB IP addresses
* New end-point to auto-associate UEs based on their IMSI through
  matching based on regexes (e.g., operator 20895 matched through Regex
  ^20895). Note that the IMSI is not always sent by a UE and NAS might
  be encrypted, making IMSI retrieval impossible
* Integration of the NetStore: Apps can be dynamically loaded onto the
  base station/agent by the controller, and be reconfigured. There is a
  sample app, and an IMSI app that works like on the controller
  (previous point), but avoids controller interaction. Further, you can
  specify a user scheduling algorithm. If OAI does not know it, it will
  request it from the controller that will search on the Store and send
  it to auto-load the corresponding scheduler. Reporting on loaded
  objects/apps in the agent/base station is enabled by default.

Fixes:
* Slice overlap testing for up to 100 RBs
* Protocol messages at the south-bound can be larger than 240 000 B
* Small documentatin update on static slicing parameters

New OAI slicing system support, MME/PLMN modif

* Support for the new slicing system in OAI
* Can dynamically add/remove MMEs in OAI
* Can rewrite the PLMN in OAI
* Uses C++14
* Documentation updates

bugfixes, internal improvements

The following improvements have been made:
* S1AP user-specific information tracked in statistics
* Correctly track the version across the project
* Improve stats_manager documentation with examples

capabilities, RRC/HO, stats conf, split reporting, S1AP

The following features have been added:
* capabilities: new endpoint /capabilities to show the active end-points
  handled by applications
* RRC/HO: improvements to RRC statistics; the RTC can trigger a handover
* stats conf: end-points to reconfigure the statistics reporting
* split reporting: fields to indicate the used split, per agent
* S1AP: report some statistics on S1AP
* a "recursive" cmake is used. protobuf fields are generated at build
  (not configure) time, and compile times are reduced

Furthermore:
* documentation has been updated and some bugs were corrected
* bugfixes
* use deterministic Pistache commit

multi-agent + event subsystem + ElasticMon app

FlexRAN v2.0

FlexRAN v1.1 remote scheduler improvements

FlexRAN v1.0 initial release