Don't follow “imports” inside generic macros

When we search for bibliography items or labels we also try to include
all files specified via `input` and `include`. We might however also
use `input` and `include` inside generic macros. This could can cause
trouble. For example: Before this commit we would to try to include the
“location” `Code/#1` when searching for cites if we used the following
TeX code:

    \newcommand{\codeinput}[1]
    {
        \begin{leftbar}
            \input{Code/#1}
        \end{leftbar}
    }

Support/lib/LaTeXUtils.rb

@@ -189,7 +189,10 @@ def initialize(old_scanner=nil)
     # Default values for the +includes+ hash.
     def set_defaults
       @includes = Hash.new
-      @includes[/^[^%]*(?:\\include|\\input)\s*\{([^}\\]*)\}/] = Proc.new {|m|
+      # We ignore inputs and includes containing a hash since these are
+      # usually used as arguments inside macros e.g. `#1` to access the first
+      # argument of a macro
+      @includes[/^[^%]*(?:\\include|\\input)\s*\{([^}\\#]*)\}/] = Proc.new {|m|
         m[0].split(",").map do |it|
           LaTeX.find_file( it.strip, "tex", File.dirname(@root) ) || raise("Could not locate any file named '#{it}'")
         end