Minor web ui improvements

<field:editor/>

• add not required attribute "height" -->

  Spring.addDecoration... ...widgetAttrs : {height : ${height}}

• attribute "disabled" is ignored -->

  Spring.addDecoration... ...widgetAttrs : {disabled: ${disabled}}

<field:display/>

• add not required attributes htmlEscape and javaScriptEscape, defaul value - "false" -->

  <spring:eval expression="object[field]" htmlEscape="${htmlEscape}" javaScriptEscape="${javaScriptEscape}"/>

<field:column/>

• provide posibility to set max text length. Don't restrict column, if value is negative.