cosmetic changes to code, cleaned/added roxygen documentation

git-svn-id: svn://svn.r-forge.r-project.org/svnroot/phylobase@915 edb9625f-4e0d-4859-8d74-9fd3b1da38cb
renaming class-multiphylo4 to multiphylo4-class, moving setAs code for this class here

git-svn-id: svn://svn.r-forge.r-project.org/svnroot/phylobase@916 edb9625f-4e0d-4859-8d74-9fd3b1da38cb
file renaming from class-*.R to *-class.R

git-svn-id: svn://svn.r-forge.r-project.org/svnroot/phylobase@917 edb9625f-4e0d-4859-8d74-9fd3b1da38cb
descendants.R not needed anymore, content moved to ancestors.R and getNode-methods.R

git-svn-id: svn://svn.r-forge.r-project.org/svnroot/phylobase@918 edb9625f-4e0d-4859-8d74-9fd3b1da38cb
deleting file, now called setAs-methods.R

git-svn-id: svn://svn.r-forge.r-project.org/svnroot/phylobase@919 edb9625f-4e0d-4859-8d74-9fd3b1da38cb
fixed @include for correct order in NAMESPACE collate, and cosmetic changes to roxygen doc

git-svn-id: svn://svn.r-forge.r-project.org/svnroot/phylobase@920 edb9625f-4e0d-4859-8d74-9fd3b1da38cb
more cosmetic changes to roxygen doc

git-svn-id: svn://svn.r-forge.r-project.org/svnroot/phylobase@921 edb9625f-4e0d-4859-8d74-9fd3b1da38cb