Removed Tree endpoints. Cleaned up others.

This should be tested together with purescript changes:
purescript-gargantext@0a62761a

.. before we start adding the transactional tests (and testing the
rollback).

It's a simple DB query, it shouldn't need any extra effect.

This commit uses the `race` function from the async library to fix a bug
where exceptions raised from the server async wouldn't be caught by the
top-level code.

The bug was stemming from the fact that `runAllWorkers` is **blocking**,
despite its usage of `forConcurrently_`. Therefore we were never
actually running the `wait` function below, but rather we were hanging
waiting on the result of the first function.

As a result the server could die but the workers could keep the main
thread alive, causing the bug we just saw as part of #463.

This commit introduces/improves the `parseTvsWithDiagnostics`
function to parse the input TSV incrementally, collecting errors
as we go, and eventually reporting them upstream via the newly
added `emitTsvParseWarning` function.

This will pave the way for a more thorough refactoring to
be able to emit diagnostics after parsing.

Also, no need for `liftBase` in `getCorpusSQLite`.

In an attempt to make the TSV parser more lenient for the absence of the
forms column, I have used NoHeader in the `decodeWithP` call, but that
caused the first line of the TSVs with a header to be interpreted as
terms, which is not what we want.

They can be enabled with `GGTX_LOG_LEVEL` during tests.

Before we were repeating the same code to initialise all the different
loggers. This commit introduces two stock loggers called `ioStdLogger`
and `monadicStdLogger` which can be reused many times.

It also allows the `GGTX_LOG_LEVEL` to take effect during `readConfig`,
so that the `startupInfo` would show up the correct information.

We can use it to implement the specific case for `serveWorkerAPI`, while
giving the user the ability to do things in the monad `m`, like
introduce specific logging.

This commit fixes a bug where a user member of a team (but NOT the owner
of such team) couldn't move nodes.

This commit correctly propagates the correct `LogConfig` in all the
places where we were just defaulting to log everything, and this allows
us to silence debug logs in tests, unless we want them.

Furthermore, the env var we used to override (in some parts) the logging
level from `LOG_LEVEL`  to `GGTX_LOG_LEVEL`, to avoid the env var
`LOG_LEVEL` clashing with some other service.

This will eventually allow us to properly override the logging level in
the tests, silencing non interesting stuff.

This will allow us to find all the use site of this function, trying to
see if we can use only `withLogger` or correctly control the logging
verbosity via the `HasLogger` and `LogInitParams`.

Removed some dead code, most notably the `Partition` and `PartitionMathod`
types which were not in actual use anywhere.
Also renamed some function arguments from single-/double-letter identifiers
to actual words.

In the process, did some restructuring of the `bridgeness` function
and removed the `Bridgeness` type, whose purpose was not clear.
Removed a bit of dead code in the process.

This simplifies call still a bit more

All calls were basically:

nlpServer <- view (nlpServerGet lang)
addDocumentsToHyperCorpus nlpServer ...