README: describe possible linux latexmk tweaks (x3)

Author: msiniscalchi

README.markdown

@@ -89,9 +89,11 @@ TeXlive has one main advantage over MikTeX: it supports file names and paths wit
 **Linux** support is coming along nicely. You need to install TeXlive; if you are on Ubuntu, note that `apt-get install texlive` will get you a working but incomplete setup. In particular, it will *not* bring in `latexmk`, which is essential to LaTeXTools. You need to install it via `apt-get install latexmk`. If on the other hand you choose to install the TeXlive distro from TUG, `latexmk` comes with it, so you don't need to do anything else. Also, to get inverse search working on ST3, make sure you set the `sublime` option in `LaTeXTools.sublime-settings` correctly; the Ubuntu package from the ST web page uses `subl`, but check from the command line first.
 
 You also need to edit the file `LaTeX.sublime-settings` in the `User` directory to make sure that the configuration reflects your preferred TeX distribution.  Open that file and scroll down to the  section titled "Platform settings." Look at the block for your OS, namely `"windows"`. Within that block, verify that the `"texpath"` setting is correct. You may also have to set the `command` option in `"builder_settings"`, which tells the builder how to invoke `latexmk`. By default (i.e., if `command` is empty or not given) it is `["latexmk", "-cd", "-e", "$pdflatex = '%E -interaction=nonstopmode -synctex=1 %S %O'", "-f", "-pdf"]`. Users have reported the following possible issues and fixes (thanks!), so if you get a "Cannot compile!" error, try the following.
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 * some distros do *not* want a space before and after the `=` in `$pdflatex = %E`. But some *do* want the space there (sigh!)
 * sometimes `latexmk` is not on the `PATH`, or the path is not correctly picked up by ST. In this case, instead of `"latexmk"`, use `"/usr/bin/latexmk"` or wherever `latexmk` is in your system. 
 * some distros require quoting the `$pdflatex` assignment, as in `"$pdflatex = \"'%E -interaction=nonstopmode -synctex=1 %S %O'\""`
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 There are several variants to deal with; each distro is a little bit different, so there are basically no universal defaults. There's not much I can do about it. Good luck! 
 
 Only the Evince PDF viewer is supported; it's installed by default on Ubuntu or, more generally, any distro that provides the Gnome desktop, and you don't need to configure anything. Backward and forward search Work For Me (TM). Hopefully they will work for you, too, but let me know if this is not the case.