unloaded datasets will not be in namespace; tryCatch in lookup
use 'getS3method' to find s3 method
call massaging for evaluation in correct envir
special-case variants of read.table
ensure 'utils' available before check; wrapper for write.csv
completions for 'install.packages'
nudge icons down a pixel
defend against missingness of completion list
don't allow width collapsing for this cell
Merge pull request #226 from rstudio/bugfix/popup-table-width

don't allow width collapsing in completion popup
add allowUnregistered to program options
Merge branch 'master' of github.com:rstudio/rstudio
improved support for unrecognized options
Merge branch 'master' into feature/r-completion-signature-tooltip

Conflicts:
	src/cpp/session/modules/SessionHelp.R
	src/gwt/src/org/rstudio/studio/client/workbench/views/console/shell/assist/CompletionPopupPanel.java
missed in merge