Added random,horizontal and vertical layour to wordcloud

- Simple mode: 1 paramter with text that will be parsed, using stopwords and each word will be counted
- Advanced: 2 parameters, the first one is the phrase, the second is the total number of occurrences. A third parameter could indicate a link to be added to each word

Also, it supports links in the text labels

This decision was made based on the lack of CORS-enabled SPARQL endpoints, which difficults the use of client-base queries.

Adding explanation when sqlite db is not writable

restoring defaults in LODSPK

add gravity, distance and charge parameter to D3forcegraph template