[MERGE] tools.html2plaintext: consistent use of lxml.etree.HTMLParser to convert HTML to plaintext
[MERGE] tools.html2plaintext: consistent use of lxml.etree.HTMLParser to convert HTML to plaintext

We used to switch to using BeautifulSoup when available, but that
lead to inconsistent behavior depending on the installed Python
packages, and sometimes to bad surprises. There is no advantage
in using BeautifulSoup rather than HTMLParser, and the latter is
always available, as we depend on lxml.
gisce/openobject-server,splbio/openobject-server,ovnicraft/openerp-server,splbio/openobject-server,gisce/openobject-server,MarkusTeufelberger/openobject-server,splbio/openobject-server,MarkusTeufelberger/openobject-server,gisce/openobject-server,ovnicraft/openerp-server,MarkusTeufelberger/openobject-server