[FIX] web: grid headers should be aligned properly
[FIX] fetchmail: do not delete a failing email when using POP

In case of IMAP, the email is simply set as read but in case of POP, the email is deleted. To avoid loosing data (e.g. misconfiguration of server), the email is kept for POP.
Bug lp:1296724, opw 605667
[FIX] point_of_sale: generate bank statement with commerical partner

When a pos session is closed & confirmed, the account.move were generated with the commercial partner except for the bank statement which prevented automatic reconciliation.
This patch uses the commercial partner also for bank statement.
Fixes #1558, #1764
[IMP] stock: stock incoterm converted to uppercase
[FIX] board: Do not offer to create dashboard when there is no action

In case we have no defined action (e.g. redirection by python code), adding a dashboard should not be possible as the rendering based on the action.
This patch hides the 'Add to Dashboard' button in search view (opw 611288)
[FIX] hr_holidays: employees cannot approve their holidays

Nor modify once approved

It wasn't possible for employees to approve their holidays themself, thanks to the GUI, but this was possible through xmlrpc calls, or when altering the html directly in the browser.
Besides, this was also possible to edit the holiday through the same trick once the holiday validated
[FIX] website_sale: pager in product list

Keep the reference to category and search view in pager.
Update the search template to include form and keep correct reference to the category (as a slug and not a parameter).
Fixes #688
[FIX] product_visible_discount: use order date to compute currency instead of current date
[FIX] sale_order_line: use order date to compute currency instead of current date
[FIX] hw_escpos:  Replaced "tab" by space

call to self.open() had a tab instead of spaces
Revert "[FIX] web: grid headers should be aligned properly"

This reverts commit 4c335588a1f5d6d1f03e17aa20e37ffe4197447c.
It leads to table widths inconsistencies: The tables take more width then before, and overflow much more than before. This can be seen in "Accounting" > "Journal Entries", in the list of the form view
[FIX] web: fix blur problem in FieldMany2One widget when clicking on autocomplete option inside a wizard
[FIX] security: ir.config_parameter should not be readable by externals
[FIX] security: externals should be able to read attachements

without having the rights to read ir.config_parameter
[FIX] security: res.groups should be readable by admins only
[FIX] security: remove read access on company critical fields
[FIX] security: disallow read on ir.sequence for externals
[FIX] email_template: security, email_template no rights for externals
[FIX] resource: security, resource not readable by externals
[IMP] doc/howtos/backend: improve exercises on relational fields