* Light client improvements (#6156)
* no seal checking
* import command and --no-seal-check for light client
* fix eth_call
* tweak registry dapps lookup
* ignore failed requests to non-server peers
* Fix connecting to wildcard addresses. (#6167)
* Don't display an overlay in case the time sync check fails. (#6164)
* Small improvements to time estimation.
* Temporarily disable NTP time check by default.
* do more validation of imported headers in light client
* generalize informant with traits
* informant implementation for light client
* make comment into TODO
* fix broken test
* disable full checking of headers in light client in sync tests
* First little bits for chain-selection.
* Provide RPCs and get settings through to user defaults.
* Hasty stash.
* Fix updater accidentally redownloading.
* Finish up.
* Add JS tests.
* Hypervisor should never run a binary modified before itself.
* Style.
* Help tweak.
* Fix test compile.
* Fix JS test
* Build fix for tests.
* Revert default chain name
* Another test
* Use spec name via client.
* Fix mock up.
* whitespace
[ci:skip]
* whitespace
[ci:skip]
* remove exit/restart endpoints.
* prune states based on memory param
* pruning memory CLI and usage in sync
* return purged value from memorydb
* calculate memory used incrementally in overlayrecentdb
* refactor shared history pruning code in client
* Fixed usage alignment
* journal_size function for fast memory calculation
* owning views of blockchain data
* port blockchain and client traits to owning views
* fix ethcore tests
* use strong headers and bodies in ethcore_light
* port ethsync to use owning views
* port rpc to owning views
* port parity informant and blockchain export
* `--mode=off` now works.
* Add Mode::Off as a persistent CLI option.
* "last" not "auto" as default.
* Commit accidentally unsaved file.
* Whitespace
[ci:skip]
* Mode CLI parse fix
* or offline
* Save mode when it gets changed.
* Fix Offline mode
* Fix up mode operations.
* Make passive default, but not overriding.
* Fix test
* Maybe not everyone wants to run an archive node...
* add auto compaction types
* pass db paths
* detect drive type on Linux
* use base db path
* add docstring
* limit the test to be side effect free
* use base db path
* more docs
* fix parsing test
* update error
* detect only on Linux
* make test Linux only
* add second device letter, update cli doc
* use spaces in cli doc
* import only on linux
* default->auto
* split journaldb commit into two functions: journal_under and mark_canonical
* use new commit mechanism in client
* Configurable history size in master
* Reduce DB history
* Configurable history size
* Set min history size
* Test
* Fixed a test and reduced the limit
* Actually enable fat db, and do RPCs for it.
* Implement HashDB traits for AccountDB.
* user defaults
* finished user defaults
* user defaults are network-dependent
* added tests for newly added functions, logger is initialized first
* dir cleanup in progress
* user_file is placed next to snapshots
* fixing requested change
