Add capability to plot shaded confidence intervals or min/max for a function.

Steps to reproduce: (PLEASE FILL IN) Start .jar locally. Enter "C2L-h-COM1-DF" in current construction conditions vulnerability model filter. Bug report thingy popped up.

Other info: (PLEASE FILL IN)

Application: BCR_Application Version: 1.2.3 Bulid Type: Development Java Version: 1.6.0_26 (Sun Microsystems Inc.) Operating System: Windows 7 (arch: x86, version: 6.1)

Exception:

java.lang.NullPointerException
	at org.opensha.sra.gui.BCR_Application.parameterChange(BCR_Application.java:626)
	at org.opensha.commons.param.AbstractParameter.firePropertyChange(AbstractParameter.java:386)
	at org.opensha.commons.param.AbstractParameter.setValue(AbstractParameter.java:210)
	at org.opensha.sra.gui.components.VulnerabilityBean.updateFilter(VulnerabilityBean.java:168)
	at org.opensha.sra.gui.components.VulnerabilityBean.access$300(VulnerabilityBean.java:38)
	at org.opensha.sra.gui.components.VulnerabilityBean$VulnerabilityParameterListener.parameterChange(VulnerabilityBean.java:187)
	at org.opensha.commons.param.AbstractParameter.firePropertyChange(AbstractParameter.java:386)
	at org.opensha.commons.param.AbstractParameter.setValue(AbstractParameter.java:210)
	at org.opensha.commons.param.editor.AbstractParameterEditor.setValue(AbstractParameterEditor.java:72)
	at org.opensha.commons.param.editor.impl.StringParameterEditor.focusLost(StringParameterEditor.java:159)
	at java.awt.AWTEventMulticaster.focusLost(Unknown Source)
	at java.awt.Component.processFocusEvent(Unknown Source)
	at java.awt.Component.processEvent(Unknown Source)
	at java.awt.Container.processEvent(Unknown Source)
	at java.awt.Component.dispatchEventImpl(Unknown Source)
	at java.awt.Container.dispatchEventImpl(Unknown Source)
	at java.awt.Component.dispatchEvent(Unknown Source)
	at java.awt.KeyboardFocusManager.redisp