ui: put the decoded FCI in a named bordered block (v2.7.12)

The file manager's decoded FCI rows now sit in a fieldset matching the
phone-simulator containers, with the symbolic file name as its legend
(pysimFsInfoHtml(sel, name)); the metadata line stays above the border.
Without a name the fieldset renders without a legend, and without
fci_hex no block is shown at all.

- tests: fieldset/legend markup, metadata line before the border, no
  legend without a name, escaped legend text, no fieldset without FCI.
- help EN/RU mention the named FCI block.

pysim_simple_server/server.py

@@ -26,7 +26,7 @@ from osmocom.tlv import BER_TLV_IE
 from osmocom.utils import rpad
 
 
-VERSION = '2.7.11'
+VERSION = '2.7.12'
 
 MAX_ENVELOPE_SEGMENTS = 5  # max SMS segments for outgoing C-APDU in ENVELOPE