update readme to set stable tag to 1.5.4.4

manage_fields.php
add title attribute to delete icon so we can see the ID of the field
single encode values are now trimmed in PDb_prep_value()

participants-database.php
private ID is cleared when an incoming record is an update so the stored private ID is kept
date_updated value is cleared on record updates so the timestamp can be set in the updated record

PDb_Field_Item class
$readonly_inputs property removed

PDb_FormElement class
readonly displays for dropdowns and multiselects
new get_value_titles($values, $fieldname) method added

PDb_List class
improvements to the process of merging POST/GET values into the filter property, renaming 'submit_button' data

PDb_Session class
PHP sessions select is now set in a plugin setting

PDb_Settings class
use PHP session setting added
fix to _get_pagelist() method: now adding blank item if needed

PDb_Shortcode class
eliminated $readonly_inputs property

xnau_FormElement class
added readonly displays doe dropdowns, radios and multiselects
added _readonly_multi() method for showing values stored as arrays
_prep_comp_string() method now trims it's output

PDb_Template class
fixed bug where the wrong object was reset after iterating, resulting in blank fields getting shown in the list


git-svn-id: https://plugins.svn.wordpress.org/participants-database/trunk@855867 b8457f37-d9ea-0310-8a92-e5e31aec5664
update stable tag to 1.5.4.5

git-svn-id: https://plugins.svn.wordpress.org/participants-database/trunk@856617 b8457f37-d9ea-0310-8a92-e5e31aec5664
minor edit to readme

git-svn-id: https://plugins.svn.wordpress.org/participants-database/trunk@856716 b8457f37-d9ea-0310-8a92-e5e31aec5664