Moved all data from data/ into inst/extdata and updated references

[ClaytonJY]

@javadch, please run R CMD check and execute examples from Examples/ directory and let me know if this new schema works.

At least one example should have never worked before: RQtTest2.R has a variable cnnString which was using Data instead of data.

I'm particularly curious about weatherR.R; that's the only place we read data directly into R, so I changed it to use system.file() as suggested by Hadley here.

This should fix #4, #7, and #10.

[javadch]

I fixed a small issue with relative paths on the devlop branch. but it does not solve this issue. When I run R CMD check, 1: "Examples" folder is not copied to the RQt.Rcheck folder. 2: it is expected to be in the root folder not in the RQt.Rcheck\RQt etc. see SHA: a925324

[ClaytonJY]

@javadch, we can not rely on ANYTHING being copied to the root of RQt.Rcheck/; any such requirement should be considered a bug. To get this thing on CRAN we need to be able to pass R CMD check in one pass, without the --no-clean option we're currently building with.

[javadch]

Is there a way, inside a function, to know whether the function is called from CHECK mode or INSTALL mode. If possible maybe I can pass some parameters to the getEngine function to tell it where to expect the config in either mode.