View source: R/is_package_available.R
| is.package.available | R Documentation | 
Use this function to check for optional package dependencies within this package.
is.package.available(package.name)
| package.name | Name of the package (as string) | 
This is a package-internal function!
See section ‘Good practice’ in '?.onAttach'.
TRUE if the packages is installed, otherwise FALSE (invisible)
http://r-pkgs.had.co.nz/description.html
tryCatchLog:::is.package.available("tryCatchLog")  # must be TRUE :-)
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