Netjsonconfig

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- `56 <https://github.com/openwisp/netjsonconfig/issues/56>`_: [general] Implemented smarter merge mechanism
- `57 <https://github.com/openwisp/netjsonconfig/issues/57>`_: [openwrt] Fixed interface ``enabled`` bug
- `7a152a3 <https://github.com/openwisp/netjsonconfig/commit/7a152a3>`_: [openwrt] Renamed ``enabled`` to ``disabled`` in OpenVPN section (for consistency)

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- `55 <https://github.com/openwisp/netjsonconfig/issues/55>`_: [vars] Fixed broken evaluation of multiple variables

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- `b486c4d <https://github.com/openwisp/netjsonconfig/commit/b486c4d>`_: [openvpn] corrected wrong ``client`` mode, renamed to ``p2p``
- `c7e51c6 <https://github.com/openwisp/netjsonconfig/commit/c7e51c6>`_: [openvpn] added ``pull`` option for clients
- `dde3128 <https://github.com/openwisp/netjsonconfig/commit/dde3128>`_: [openvpn] differentiate server between manual, routed and bridged

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- added ``OpenVpn`` backend
- `afbc3a3 <https://github.com/openwisp/netjsonconfig/commit/afbc3a3>`_: [openwisp] fixed openvpn integration (partially backward incompatible)
- `1234c34 <https://github.com/openwisp/netjsonconfig/commit/1234c34>`_: [context] improved flexibility of configuration variables
- `54 <https://github.com/openwisp/netjsonconfig/issues/54>`_: [openwrt] fixed netmask issue on ipv4

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- `53 <https://github.com/openwisp/netjsonconfig/issues/53>`_: [docs] avoid ambiguity on dashes in context
- `52 <https://github.com/openwisp/netjsonconfig/pull/52>`_: [schema] added countries list as ``enum``
for radios (thanks to `zachantre <https://github.com/zachantre>`_)

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- `50 <https://github.com/openwisp/netjsonconfig/issues/50>`_: [openwrt] add logical name to all generated configuration items