[schema] Cache RQL expressions on schema loading
Add a mapping rql string to rql statement
Deserializing schema is ~36% faster with a lot (> 4000) expressions like those
generated by cubicweb-container.
* {
color: #000 !important;
}
div#popupLoginBox,
div#popupLoginBox,
img#logo, div.header,
#navColumnLeft, #navColumnRight,
#footer {
display: none
}
div#pageContent{
border: none;
}