foamSearch: new script that searches a directory for

dictionary files of a particular name and extracts entries of a
particular keyword, sorting results into a unique list.

For example,
    foamSearch $FOAM_TUTORIALS laplacianSchemes.default fvSchemes

produces...
    default         Gauss linear corrected;
    default         Gauss linear limited corrected 0.33;
    default         Gauss linear limited corrected 0.5;
    default         Gauss linear orthogonal;
    default         Gauss linear uncorrected;
    default         none;

Uses the fantastic foamDictionary utility.