02 20 code maintenance

General code maintenance:
- remove dead code
- remove as many `#define` as possible and use `constexpr` instead
- remove adafs occurrences and replace with gkfs
- reformat code to unify code style as of CPPCoreGuidelines
- rearrange imports, remove unused imports
- separate cmake configurations and FS configurations
- encapsulate non-prefix gkfs functions into namespaces
- change copyright statement to 2020
- cleanup of some irrelevant code and unnecessary struct definitions
- consistent renaming for rpc sender functions and create and remove functions from client to daemon
- encapsulate all code into namespaces even if naming and structuring is tentative

See merge request !31

gkfs::hg_tag -> gkfs::rpc::tag
gkfs::utils -> gkfs::util
gkfs::client -> gkfs::util
gkfs::logging -> gkfs::log

to avoid name clash with rpc types

Reformatted code w.r.t. unifying code styles as of the official
CPPCoreGuidelines by Stroustrup and Sutter

Restructuring code w.r.t. configurations and definitions:
- #defines have been mostly removed from configurations
- a dedicated config file has been added for configurations with constexpr
- past configure file is now only a cmake wrapper
- wrapping global functions into namespaces

Removed all adafs and ifs occurrences. Now called gkfs

Resolve "[Mogon II] Fix dependency compilation scripts"

Closes #45

See merge request !25

Marc Vef authored Feb 06, 2020 and Alberto Miranda committed Feb 06, 2020

--cluster argument has been removed for --config and instead uses predefined configs of a number of dependencies: mogon2, direct, all

--dependency overwrites --config and accepts multiple dependencies (space-separated)

Closes #74

See merge request !30

Fixes #74.

Closes #73

Resolve "Replace Margo with Mercury in client code"

See merge request !29

Closes #32 #72

This commit updates Hermes to v0.4.1 and configures it to generate RPCs
with "instrumentation breadcrumbs" that can be understood by servers
relying on Margo >= v0.5.2. Fixes #72.

Resolve "Solve MN4 issues in #32"

See merge request !28