bioconductor compatibility

[Fersoil]

checks performed by:

BiocCheck::BiocCheck('new-package'=TRUE)
BiocCheck::BiocCheckGitClone()

gives some warnings and errors still, to be decided whether we want to fix them:

1. WARNING: package version should be 0.99.0 for new packages in Bioconductor
2. ERROR: Unable to find your email in the Support Site: HTTP 404 Not Found.
3. WARNING: Empty or missing \value sections found in man pages.
4. ERROR: System files found that should not be Git tracked. PvSTATEM.Rproj

3rd warning is difficult to fix, since the \value fields in R6 objects causes undesirable formatting. This field should be used as a @return statement, but when the method from the R6 class contains this field, its value is shown at the beginning of the documentation of the class.

[Fersoil]

Another requirements that cannot be checked via cmd is the size of output package - for now it sums up to 863 KB after compressing with devtools:build()

The build time takes less than 10 minues.

[Fersoil]

List of changes made:

• removed the library and require imports from the R files
• organized the imports in DESCRIPTION and NAMESPACE files
• added NEWS.md
• added myself to Bioconductor mailing list
• added examples in majority of exported methods
• formatted LICENSE and LICENSE.md files according to R guidelines
• removed precommit file from build
• documentation fixes

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 63.41463% with 15 lines in your changes missing coverage. Please review.

Project coverage is 58.36%. Comparing base (2e5436c) to head (c2af9d0).

Files	Patch %	Lines
R/classes.R	70.83%	7 Missing :warning:
R/read_data.R	55.55%	4 Missing :warning:
R/standard_curves.R	50.00%	4 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## dev #47 +/- ## ========================================== + Coverage 58.26% 58.36% +0.09% ========================================== Files 3 3 Lines 901 915 +14 ========================================== + Hits 525 534 +9 - Misses 376 381 +5 ```

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