avoid conversion warning by reducing the size value type

Update graft algorithm setting for graft fork

Graft is forking soon, with updated software released yesterday, to what
will be v8 in Graft (current Graft cryptonight algorithm is graft v7).
This commit updates the `graft` algorithm to recognize the fork and
switch algorithms.

Fork annoucement:
https://www.graft.network/2018/04/12/patch-1-1-1-released-major-network-update-block-65110/

Fix FAQ link

The link to the `monero7` FAQ was dead because it tried to go to a new page

refactor scratchpad creation

amd simplify kernel for different algorithms

Use the maximum scratchpad size from before and after the fork.

- remove version numbers within the kernel
- create seperate program context for each mining algorithm
- remove kernel `cn1_monero` is now integrated in `cn1`
- remname `cnX` kernel in `cnX + algorithmNumber`

Fix spelling mistake in gpu.cpp

Repair all 'namepsace' to 'namespace' (all within comments)

Add CROAT coin

Add support for Haven (XHV) using CryptoNight Heavy

NVIDIA: fix sumokoin

sumokoin is broken if `bfactor >= 5` is used (default for windows)
sumokoin for `sm_20` is broken due to the missing extern shared memory

- call phase3 kernel two times if sumokoin is enabled
- create extern shared memory for phase3 kernel

fix cuda architecture detection

fix #1297

If sm_20 is mixed with other architectures the detection for the minimal supported architecture is broken.

AMD OpenCL: fix sumokoin

- fix that version argument was not passed to extended kernel parameters

Change vid

increase version for release to 2.4.0

add stellite coin

-rename `mining_fork_height` to `*_version`

- add `fork_height` to currency
- refactor algorithm selection

Add cn-heavy to algo report

fix OpenCl AMD on OSX

Remove portbin from docs for now

fix #1218

- remove inline function with ugly macro :-(

fix minor text issues in compile.md